61004039731 has 4 divisors (see below), whose sum is σ = 61004858200. Its totient is φ = 61003221264.

The previous prime is 61004039659. The next prime is 61004039737. The reversal of 61004039731 is 13793040016.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61004039731 is a prime.

It is a super-2 number, since 2×61004039731² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61004039737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 284826 + ... + 450703.

It is an arithmetic number, because the mean of its divisors is an integer number (15251214550).

Almost surely, 2^61004039731 is an apocalyptic number.

61004039731 is a deficient number, since it is larger than the sum of its proper divisors (818469).

61004039731 is an equidigital number, since it uses as much as digits as its factorization.

61004039731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818468.

The product of its (nonzero) digits is 13608, while the sum is 34.

Adding to 61004039731 its reverse (13793040016), we get a palindrome (74797079747).

The spelling of 61004039731 in words is "sixty-one billion, four million, thirty-nine thousand, seven hundred thirty-one".