1626725021 has 2 divisors, whose sum is σ = 1626725022. Its totient is φ = 1626725020.

The previous prime is 1626724999. The next prime is 1626725027. The reversal of 1626725021 is 1205276261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1424232121 + 202492900 = 37739^2 + 14230^2 .

It is a cyclic number.

It is not a de Polignac number, because 1626725021 - 2¹⁴ = 1626708637 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 (1626725027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 813362510 + 813362511.

It is an arithmetic number, because the mean of its divisors is an integer number (813362511).

Almost surely, 2^1626725021 is an apocalyptic number.

It is an amenable number.

1626725021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1626725021 is an equidigital number, since it uses as much as digits as its factorization.

1626725021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 1626725021 is about 40332.6793183890. The cubic root of 1626725021 is about 1176.0832071739.

The spelling of 1626725021 in words is "one billion, six hundred twenty-six million, seven hundred twenty-five thousand, twenty-one".