1156506221 has 8 divisors (see below), whose sum is σ = 1250639544. Its totient is φ = 1063111680.

The previous prime is 1156506203. The next prime is 1156506227. The reversal of 1156506221 is 1226056511.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 92833225 + 1063672996 = 9635^2 + 32614^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1156506221 - 2¹⁸ = 1156244077 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 (1156506227) 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 7 ways as a sum of consecutive naturals, for example, 181436 + ... + 187701.

It is an arithmetic number, because the mean of its divisors is an integer number (156329943).

Almost surely, 2^1156506221 is an apocalyptic number.

It is an amenable number.

1156506221 is a deficient number, since it is larger than the sum of its proper divisors (94133323).

1156506221 is a wasteful number, since it uses less digits than its factorization.

1156506221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369391.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 1156506221 is about 34007.4436116566. The cubic root of 1156506221 is about 1049.6616357957.

The spelling of 1156506221 in words is "one billion, one hundred fifty-six million, five hundred six thousand, two hundred twenty-one".