61916639 has 2 divisors, whose sum is σ = 61916640. Its totient is φ = 61916638.

The previous prime is 61916627. The next prime is 61916707. The reversal of 61916639 is 93661916.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61916639 - 2²⁰ = 60868063 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 61916596 and 61916605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61916609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30958319 + 30958320.

It is an arithmetic number, because the mean of its divisors is an integer number (30958320).

Almost surely, 2^61916639 is an apocalyptic number.

61916639 is a deficient number, since it is larger than the sum of its proper divisors (1).

61916639 is an equidigital number, since it uses as much as digits as its factorization.

61916639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52488, while the sum is 41.

The square root of 61916639 is about 7868.7126647248. The cubic root of 61916639 is about 395.6116976444.

The spelling of 61916639 in words is "sixty-one million, nine hundred sixteen thousand, six hundred thirty-nine".