51620651 has 2 divisors, whose sum is σ = 51620652. Its totient is φ = 51620650.

The previous prime is 51620593. The next prime is 51620659. The reversal of 51620651 is 15602615.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51620651 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51620651.

It is not a weakly prime, because it can be changed into another prime (51620659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25810325 + 25810326.

It is an arithmetic number, because the mean of its divisors is an integer number (25810326).

Almost surely, 2^51620651 is an apocalyptic number.

51620651 is a deficient number, since it is larger than the sum of its proper divisors (1).

51620651 is an equidigital number, since it uses as much as digits as its factorization.

51620651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 51620651 is about 7184.7512830995. The cubic root of 51620651 is about 372.3412557231.

The spelling of 51620651 in words is "fifty-one million, six hundred twenty thousand, six hundred fifty-one".