51624613 has 2 divisors, whose sum is σ = 51624614. Its totient is φ = 51624612.

The previous prime is 51624607. The next prime is 51624647. The reversal of 51624613 is 31642615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47032164 + 4592449 = 6858^2 + 2143^2 .

It is a cyclic number.

It is not a de Polignac number, because 51624613 - 2⁹ = 51624101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51624913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25812306 + 25812307.

It is an arithmetic number, because the mean of its divisors is an integer number (25812307).

Almost surely, 2^51624613 is an apocalyptic number.

It is an amenable number.

51624613 is a deficient number, since it is larger than the sum of its proper divisors (1).

51624613 is an equidigital number, since it uses as much as digits as its factorization.

51624613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 28.

The square root of 51624613 is about 7185.0270006452. The cubic root of 51624613 is about 372.3507814864.

The spelling of 51624613 in words is "fifty-one million, six hundred twenty-four thousand, six hundred thirteen".