1255643531 has 4 divisors (see below), whose sum is σ = 1310236752. Its totient is φ = 1201050312.

The previous prime is 1255643527. The next prime is 1255643593. The reversal of 1255643531 is 1353465521.

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 1255643531 - 2² = 1255643527 is a prime.

It is a super-2 number, since 2×1255643531² = 3153281353884295922, 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 = 1255643491 and 1255643500.

It is not an unprimeable number, because it can be changed into a prime (1255613531) 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, 27296576 + ... + 27296621.

It is an arithmetic number, because the mean of its divisors is an integer number (327559188).

Almost surely, 2^1255643531 is an apocalyptic number.

1255643531 is a deficient number, since it is larger than the sum of its proper divisors (54593221).

1255643531 is an equidigital number, since it uses as much as digits as its factorization.

1255643531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54593220.

The product of its digits is 54000, while the sum is 35.

The square root of 1255643531 is about 35435.0607590844. The cubic root of 1255643531 is about 1078.8360605769.

The spelling of 1255643531 in words is "one billion, two hundred fifty-five million, six hundred forty-three thousand, five hundred thirty-one".