61310239 has 2 divisors, whose sum is σ = 61310240. Its totient is φ = 61310238.

The previous prime is 61310237. The next prime is 61310243. The reversal of 61310239 is 93201316.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61310239 - 2¹ = 61310237 is a prime.

Together with 61310237, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61310237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30655119 + 30655120.

It is an arithmetic number, because the mean of its divisors is an integer number (30655120).

Almost surely, 2^61310239 is an apocalyptic number.

61310239 is a deficient number, since it is larger than the sum of its proper divisors (1).

61310239 is an equidigital number, since it uses as much as digits as its factorization.

61310239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 61310239 is about 7830.0855040031. The cubic root of 61310239 is about 394.3159425682.

The spelling of 61310239 in words is "sixty-one million, three hundred ten thousand, two hundred thirty-nine".