1252656157 has 4 divisors (see below), whose sum is σ = 1265570236. Its totient is φ = 1239742080.

The previous prime is 1252656137. The next prime is 1252656179. The reversal of 1252656157 is 7516562521.

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

It can be written as a sum of positive squares in 2 ways, for example, as 327827236 + 924828921 = 18106^2 + 30411^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1252656157 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 (1252656137) 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, 6456894 + ... + 6457087.

It is an arithmetic number, because the mean of its divisors is an integer number (316392559).

Almost surely, 2^1252656157 is an apocalyptic number.

It is an amenable number.

1252656157 is a deficient number, since it is larger than the sum of its proper divisors (12914079).

1252656157 is an equidigital number, since it uses as much as digits as its factorization.

1252656157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12914078.

The product of its digits is 126000, while the sum is 40.

The square root of 1252656157 is about 35392.8828579984. The cubic root of 1252656157 is about 1077.9798074498.

The spelling of 1252656157 in words is "one billion, two hundred fifty-two million, six hundred fifty-six thousand, one hundred fifty-seven".