1257312512 has 36 divisors (see below), whose sum is σ = 2513923776. Its totient is φ = 627601920.

The previous prime is 1257312461. The next prime is 1257312521. The reversal of 1257312512 is 2152137521.

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, 161837 + ... + 169427.

It is an arithmetic number, because the mean of its divisors is an integer number (69831216).

Almost surely, 2^1257312512 is an apocalyptic number.

It is an amenable number.

1257312512 is a deficient number, since it is larger than the sum of its proper divisors (1256611264).

1257312512 is an frugal number, since it uses more digits than its factorization.

1257312512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8254 (or 8240 counting only the distinct ones).

The product of its digits is 4200, while the sum is 29.

The square root of 1257312512 is about 35458.6027925523. The cubic root of 1257312512 is about 1079.3138394142.

The spelling of 1257312512 in words is "one billion, two hundred fifty-seven million, three hundred twelve thousand, five hundred twelve".