61931039 has 4 divisors (see below), whose sum is σ = 61958040. Its totient is φ = 61904040.

The previous prime is 61931029. The next prime is 61931041. The reversal of 61931039 is 93013916.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61931039 - 2⁸ = 61930783 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61930996 and 61931014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61931029) 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 3 ways as a sum of consecutive naturals, for example, 9704 + ... + 14765.

It is an arithmetic number, because the mean of its divisors is an integer number (15489510).

Almost surely, 2^61931039 is an apocalyptic number.

61931039 is a deficient number, since it is larger than the sum of its proper divisors (27001).

61931039 is a wasteful number, since it uses less digits than its factorization.

61931039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27000.

The product of its (nonzero) digits is 4374, while the sum is 32.

The square root of 61931039 is about 7869.6276277852. The cubic root of 61931039 is about 395.6423645053.

The spelling of 61931039 in words is "sixty-one million, nine hundred thirty-one thousand, thirty-nine".