51604613 has 2 divisors, whose sum is σ = 51604614. Its totient is φ = 51604612.

The previous prime is 51604583. The next prime is 51604621. The reversal of 51604613 is 31640615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28111204 + 23493409 = 5302^2 + 4847^2 .

It is a cyclic number.

It is not a de Polignac number, because 51604613 - 2⁶ = 51604549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51603613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25802306 + 25802307.

It is an arithmetic number, because the mean of its divisors is an integer number (25802307).

Almost surely, 2^51604613 is an apocalyptic number.

It is an amenable number.

51604613 is a deficient number, since it is larger than the sum of its proper divisors (1).

51604613 is an equidigital number, since it uses as much as digits as its factorization.

51604613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 51604613 is about 7183.6350826027. The cubic root of 51604613 is about 372.3026908756.

The spelling of 51604613 in words is "fifty-one million, six hundred four thousand, six hundred thirteen".