1213550231 has 4 divisors (see below), whose sum is σ = 1213762464. Its totient is φ = 1213338000.

The previous prime is 1213550227. The next prime is 1213550243. The reversal of 1213550231 is 1320553121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1213550231 - 2² = 1213550227 is a prime.

It is a super-2 number, since 2×1213550231² = 2945408326320306722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213550197 and 1213550206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213550251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97295 + ... + 109056.

It is an arithmetic number, because the mean of its divisors is an integer number (303440616).

Almost surely, 2^1213550231 is an apocalyptic number.

1213550231 is a deficient number, since it is larger than the sum of its proper divisors (212233).

1213550231 is an equidigital number, since it uses as much as digits as its factorization.

1213550231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212232.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 1213550231 is about 34836.0478671160. The cubic root of 1213550231 is about 1066.6434048421.

The spelling of 1213550231 in words is "one billion, two hundred thirteen million, five hundred fifty thousand, two hundred thirty-one".