612752121 has 20 divisors (see below), whose sum is σ = 916409472. Its totient is φ = 408026808.

The previous prime is 612752089. The next prime is 612752143. The reversal of 612752121 is 121257216.

612752121 is a `hidden beast` number, since 612 + 7 + 5 + 21 + 21 = 666.

It is not a de Polignac number, because 612752121 - 2⁵ = 612752089 is a prime.

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 (612752191) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 74416 + ... + 82238.

Almost surely, 2^612752121 is an apocalyptic number.

It is an amenable number.

612752121 is a deficient number, since it is larger than the sum of its proper divisors (303657351).

612752121 is an equidigital number, since it uses as much as digits as its factorization.

612752121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8802 (or 8793 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 612752121 is about 24753.8304308646. The cubic root of 612752121 is about 849.3661345799.

The spelling of 612752121 in words is "six hundred twelve million, seven hundred fifty-two thousand, one hundred twenty-one".