1255126531 has 4 divisors (see below), whose sum is σ = 1256356864. Its totient is φ = 1253896200.

The previous prime is 1255126511. The next prime is 1255126547. The reversal of 1255126531 is 1356215521.

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 1255126531 - 2⁷ = 1255126403 is a prime.

It is a super-2 number, since 2×1255126531² = 3150685217640187922, 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 = 1255126493 and 1255126502.

It is not an unprimeable number, because it can be changed into a prime (1255126501) 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, 613635 + ... + 615676.

It is an arithmetic number, because the mean of its divisors is an integer number (314089216).

Almost surely, 2^1255126531 is an apocalyptic number.

1255126531 is a deficient number, since it is larger than the sum of its proper divisors (1230333).

1255126531 is a wasteful number, since it uses less digits than its factorization.

1255126531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1230332.

The product of its digits is 9000, while the sum is 31.

The square root of 1255126531 is about 35427.7649732523. The cubic root of 1255126531 is about 1078.6879732157.

The spelling of 1255126531 in words is "one billion, two hundred fifty-five million, one hundred twenty-six thousand, five hundred thirty-one".