612508881 has 16 divisors (see below), whose sum is σ = 863589888. Its totient is φ = 385526400.

The previous prime is 612508847. The next prime is 612508903. The reversal of 612508881 is 188805216.

It is not a de Polignac number, because 612508881 - 2²¹ = 610411729 is a prime.

It is a super-2 number, since 2×612508881² = 750334258607744322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (612578881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76506 + ... + 84131.

It is an arithmetic number, because the mean of its divisors is an integer number (53974368).

Almost surely, 2^612508881 is an apocalyptic number.

It is an amenable number.

612508881 is a deficient number, since it is larger than the sum of its proper divisors (251081007).

612508881 is a wasteful number, since it uses less digits than its factorization.

612508881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160712.

The product of its (nonzero) digits is 30720, while the sum is 39.

The square root of 612508881 is about 24748.9167641737. The cubic root of 612508881 is about 849.2537306920.

The spelling of 612508881 in words is "six hundred twelve million, five hundred eight thousand, eight hundred eighty-one".