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1221031229 = 11111002839
BaseRepresentation
bin100100011000111…
…0111010100111101
310011002120210221212
41020301313110331
510000040444404
6321054534205
742154410545
oct11061672475
93132523855
101221031229
11577270920
122a0b07365
13165c790b2
14b8246325
15722e206e
hex48c7753d

1221031229 has 4 divisors (see below), whose sum is σ = 1332034080. Its totient is φ = 1110028380.

The previous prime is 1221031211. The next prime is 1221031241. The reversal of 1221031229 is 9221301221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1221031229 - 212 = 1221027133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221031289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55501409 + ... + 55501430.

It is an arithmetic number, because the mean of its divisors is an integer number (333008520).

Almost surely, 21221031229 is an apocalyptic number.

It is an amenable number.

1221031229 is a deficient number, since it is larger than the sum of its proper divisors (111002851).

1221031229 is a wasteful number, since it uses less digits than its factorization.

1221031229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111002850.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1221031229 is about 34943.2572751883. The cubic root of 1221031229 is about 1068.8307106198.

The spelling of 1221031229 in words is "one billion, two hundred twenty-one million, thirty-one thousand, two hundred twenty-nine".

Divisors: 1 11 111002839 1221031229