51608621 has 2 divisors, whose sum is σ = 51608622. Its totient is φ = 51608620.

The previous prime is 51608597. The next prime is 51608663. The reversal of 51608621 is 12680615.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38576521 + 13032100 = 6211^2 + 3610^2 .

It is a cyclic number.

It is not a de Polignac number, because 51608621 - 2¹⁴ = 51592237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51604621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25804310 + 25804311.

It is an arithmetic number, because the mean of its divisors is an integer number (25804311).

Almost surely, 2^51608621 is an apocalyptic number.

It is an amenable number.

51608621 is a deficient number, since it is larger than the sum of its proper divisors (1).

51608621 is an equidigital number, since it uses as much as digits as its factorization.

51608621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 51608621 is about 7183.9140445860. The cubic root of 51608621 is about 372.3123292294.

The spelling of 51608621 in words is "fifty-one million, six hundred eight thousand, six hundred twenty-one".