612523821 has 64 divisors (see below), whose sum is σ = 1071415296. Its totient is φ = 302054400.

The previous prime is 612523783. The next prime is 612523829. The reversal of 612523821 is 128325216.

It is not a de Polignac number, because 612523821 - 2¹⁷ = 612392749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (612523829) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 886086 + ... + 886776.

It is an arithmetic number, because the mean of its divisors is an integer number (16740864).

Almost surely, 2^612523821 is an apocalyptic number.

It is an amenable number.

612523821 is a deficient number, since it is larger than the sum of its proper divisors (458891475).

612523821 is a wasteful number, since it uses less digits than its factorization.

612523821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922.

The product of its digits is 5760, while the sum is 30.

The square root of 612523821 is about 24749.2185937253. The cubic root of 612523821 is about 849.2606354886.

The spelling of 612523821 in words is "six hundred twelve million, five hundred twenty-three thousand, eight hundred twenty-one".