612039821 has 4 divisors (see below), whose sum is σ = 638650272. Its totient is φ = 585429372.

The previous prime is 612039817. The next prime is 612039839. The reversal of 612039821 is 128930216.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 612039821 - 2² = 612039817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (612039121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13305191 + ... + 13305236.

It is an arithmetic number, because the mean of its divisors is an integer number (159662568).

Almost surely, 2^612039821 is an apocalyptic number.

It is an amenable number.

612039821 is a deficient number, since it is larger than the sum of its proper divisors (26610451).

612039821 is a wasteful number, since it uses less digits than its factorization.

612039821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26610450.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 612039821 is about 24739.4385748747. The cubic root of 612039821 is about 849.0368888380.

The spelling of 612039821 in words is "six hundred twelve million, thirty-nine thousand, eight hundred twenty-one".