51620659 has 2 divisors, whose sum is σ = 51620660. Its totient is φ = 51620658.

The previous prime is 51620651. The next prime is 51620669. The reversal of 51620659 is 95602615.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51620659 - 2³ = 51620651 is a prime.

It is not a weakly prime, because it can be changed into another prime (51620651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25810329 + 25810330.

It is an arithmetic number, because the mean of its divisors is an integer number (25810330).

Almost surely, 2^51620659 is an apocalyptic number.

51620659 is a deficient number, since it is larger than the sum of its proper divisors (1).

51620659 is an equidigital number, since it uses as much as digits as its factorization.

51620659 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 51620659 is about 7184.7518398341. The cubic root of 51620659 is about 372.3412749578.

The spelling of 51620659 in words is "fifty-one million, six hundred twenty thousand, six hundred fifty-nine".