1255513520 has 40 divisors (see below), whose sum is σ = 2921156784. Its totient is φ = 501846272.

The previous prime is 1255513517. The next prime is 1255513537. The reversal of 1255513520 is 253155521.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126167 + ... + 135753.

Almost surely, 2^1255513520 is an apocalyptic number.

1255513520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1255513520 is an abundant number, since it is smaller than the sum of its proper divisors (1665643264).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1255513520 is a wasteful number, since it uses less digits than its factorization.

1255513520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11237 (or 11231 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 29.

The square root of 1255513520 is about 35433.2262149525. The cubic root of 1255513520 is about 1078.7988245852.

The spelling of 1255513520 in words is "one billion, two hundred fifty-five million, five hundred thirteen thousand, five hundred twenty".