612626221 has 2 divisors, whose sum is σ = 612626222. Its totient is φ = 612626220.

The previous prime is 612626213. The next prime is 612626227. The reversal of 612626221 is 122626216.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 430106121 + 182520100 = 20739^2 + 13510^2 .

It is a cyclic number.

It is not a de Polignac number, because 612626221 - 2³ = 612626213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 612626221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (612626227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306313110 + 306313111.

It is an arithmetic number, because the mean of its divisors is an integer number (306313111).

Almost surely, 2^612626221 is an apocalyptic number.

It is an amenable number.

612626221 is a deficient number, since it is larger than the sum of its proper divisors (1).

612626221 is an equidigital number, since it uses as much as digits as its factorization.

612626221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 28.

The square root of 612626221 is about 24751.2872594538. The cubic root of 612626221 is about 849.3079585153.

The spelling of 612626221 in words is "six hundred twelve million, six hundred twenty-six thousand, two hundred twenty-one".