1256135012 has 12 divisors (see below), whose sum is σ = 2398076016. Its totient is φ = 570970440.

The previous prime is 1256134991. The next prime is 1256135021. The reversal of 1256135012 is 2105316521.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14274218 + ... + 14274305.

It is an arithmetic number, because the mean of its divisors is an integer number (199839668).

Almost surely, 2^1256135012 is an apocalyptic number.

It is an amenable number.

1256135012 is a deficient number, since it is larger than the sum of its proper divisors (1141941004).

1256135012 is a wasteful number, since it uses less digits than its factorization.

1256135012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28548538 (or 28548536 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 1256135012 is about 35441.9950341399. The cubic root of 1256135012 is about 1078.9768006961.

The spelling of 1256135012 in words is "one billion, two hundred fifty-six million, one hundred thirty-five thousand, twelve".