612739021 has 4 divisors (see below), whose sum is σ = 639379872. Its totient is φ = 586098172.

The previous prime is 612739019. The next prime is 612739033. The reversal of 612739021 is 120937216.

612739021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 612739021 - 2¹ = 612739019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (612739081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13320391 + ... + 13320436.

It is an arithmetic number, because the mean of its divisors is an integer number (159844968).

Almost surely, 2^612739021 is an apocalyptic number.

It is an amenable number.

612739021 is a deficient number, since it is larger than the sum of its proper divisors (26640851).

612739021 is a wasteful number, since it uses less digits than its factorization.

612739021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26640850.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 612739021 is about 24753.5658239374. The cubic root of 612739021 is about 849.3600816833.

The spelling of 612739021 in words is "six hundred twelve million, seven hundred thirty-nine thousand, twenty-one".