51622621 has 2 divisors, whose sum is σ = 51622622. Its totient is φ = 51622620.

The previous prime is 51622577. The next prime is 51622633. The reversal of 51622621 is 12622615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41925625 + 9696996 = 6475^2 + 3114^2 .

It is a cyclic number.

It is not a de Polignac number, because 51622621 - 2¹³ = 51614429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51625621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25811310 + 25811311.

It is an arithmetic number, because the mean of its divisors is an integer number (25811311).

Almost surely, 2^51622621 is an apocalyptic number.

It is an amenable number.

51622621 is a deficient number, since it is larger than the sum of its proper divisors (1).

51622621 is an equidigital number, since it uses as much as digits as its factorization.

51622621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 25.

The square root of 51622621 is about 7184.8883776994. Note that the first 3 decimals coincide. The cubic root of 51622621 is about 372.3459922186.

The spelling of 51622621 in words is "fifty-one million, six hundred twenty-two thousand, six hundred twenty-one".