612593021 has 2 divisors, whose sum is σ = 612593022. Its totient is φ = 612593020.

The previous prime is 612592991. The next prime is 612593057. The reversal of 612593021 is 120395216.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 388641796 + 223951225 = 19714^2 + 14965^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-612593021 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (612593621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306296510 + 306296511.

It is an arithmetic number, because the mean of its divisors is an integer number (306296511).

Almost surely, 2^612593021 is an apocalyptic number.

It is an amenable number.

612593021 is a deficient number, since it is larger than the sum of its proper divisors (1).

612593021 is an equidigital number, since it uses as much as digits as its factorization.

612593021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 612593021 is about 24750.6165781784. The cubic root of 612593021 is about 849.2926160804.

The spelling of 612593021 in words is "six hundred twelve million, five hundred ninety-three thousand, twenty-one".