612055521 has 72 divisors (see below), whose sum is σ = 1163713824. Its totient is φ = 317882880.

The previous prime is 612055511. The next prime is 612055541. The reversal of 612055521 is 125550216.

It is not a de Polignac number, because 612055521 - 2⁷ = 612055393 is a prime.

It is a super-2 number, since 2×612055521² = 749223921573162882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (612055511) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 128641 + ... + 133313.

It is an arithmetic number, because the mean of its divisors is an integer number (16162692).

Almost surely, 2^612055521 is an apocalyptic number.

It is an amenable number.

612055521 is a deficient number, since it is larger than the sum of its proper divisors (551658303).

612055521 is a wasteful number, since it uses less digits than its factorization.

612055521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4713 (or 4694 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 612055521 is about 24739.7558799597. The cubic root of 612055521 is about 849.0441485863.

The spelling of 612055521 in words is "six hundred twelve million, fifty-five thousand, five hundred twenty-one".