51619639 has 2 divisors, whose sum is σ = 51619640. Its totient is φ = 51619638.

The previous prime is 51619597. The next prime is 51619649. The reversal of 51619639 is 93691615.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51619639 - 2⁷ = 51619511 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51619649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25809819 + 25809820.

It is an arithmetic number, because the mean of its divisors is an integer number (25809820).

Almost surely, 2^51619639 is an apocalyptic number.

51619639 is a deficient number, since it is larger than the sum of its proper divisors (1).

51619639 is an equidigital number, since it uses as much as digits as its factorization.

51619639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43740, while the sum is 40.

The square root of 51619639 is about 7184.6808558209. The cubic root of 51619639 is about 372.3388225121.

The spelling of 51619639 in words is "fifty-one million, six hundred nineteen thousand, six hundred thirty-nine".