1256572153 has 4 divisors (see below), whose sum is σ = 1330488180. Its totient is φ = 1182656128.

The previous prime is 1256572139. The next prime is 1256572157. The reversal of 1256572153 is 3512756521.

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 981443584 + 275128569 = 31328^2 + 16587^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1256572153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1256572157) 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, 36957988 + ... + 36958021.

It is an arithmetic number, because the mean of its divisors is an integer number (332622045).

Almost surely, 2^1256572153 is an apocalyptic number.

It is an amenable number.

1256572153 is a deficient number, since it is larger than the sum of its proper divisors (73916027).

1256572153 is an equidigital number, since it uses as much as digits as its factorization.

1256572153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73916026.

The product of its digits is 63000, while the sum is 37.

The square root of 1256572153 is about 35448.1614897021. The cubic root of 1256572153 is about 1079.1019492112.

The spelling of 1256572153 in words is "one billion, two hundred fifty-six million, five hundred seventy-two thousand, one hundred fifty-three".