51724609 has 2 divisors, whose sum is σ = 51724610. Its totient is φ = 51724608.

The previous prime is 51724601. The next prime is 51724633. The reversal of 51724609 is 90642715.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40602384 + 11122225 = 6372^2 + 3335^2 .

It is a cyclic number.

It is not a de Polignac number, because 51724609 - 2³ = 51724601 is a prime.

It is not a weakly prime, because it can be changed into another prime (51724601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25862304 + 25862305.

It is an arithmetic number, because the mean of its divisors is an integer number (25862305).

Almost surely, 2^51724609 is an apocalyptic number.

It is an amenable number.

51724609 is a deficient number, since it is larger than the sum of its proper divisors (1).

51724609 is an equidigital number, since it uses as much as digits as its factorization.

51724609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 51724609 is about 7191.9822719470. The cubic root of 51724609 is about 372.5910388117.

The spelling of 51724609 in words is "fifty-one million, seven hundred twenty-four thousand, six hundred nine".