61312239 has 6 divisors (see below), whose sum is σ = 88562136. Its totient is φ = 40874820.

The previous prime is 61312201. The next prime is 61312243. The reversal of 61312239 is 93221316.

61312239 is a `hidden beast` number, since 613 + 12 + 2 + 39 = 666.

It is not a de Polignac number, because 61312239 - 2⁸ = 61311983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61312249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3406227 + ... + 3406244.

It is an arithmetic number, because the mean of its divisors is an integer number (14760356).

Almost surely, 2^61312239 is an apocalyptic number.

61312239 is a deficient number, since it is larger than the sum of its proper divisors (27249897).

61312239 is a wasteful number, since it uses less digits than its factorization.

61312239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6812477 (or 6812474 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 61312239 is about 7830.2132154878. The cubic root of 61312239 is about 394.3202301789.

The spelling of 61312239 in words is "sixty-one million, three hundred twelve thousand, two hundred thirty-nine".