61015931 has 2 divisors, whose sum is σ = 61015932. Its totient is φ = 61015930.

The previous prime is 61015891. The next prime is 61015939. The reversal of 61015931 is 13951016.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61015931 - 2²² = 56821627 is a prime.

It is a super-2 number, since 2×61015931² = 7445887671593522, which contains 22 as substring.

It is a Chen prime.

It is a zygodrome in base 5.

It is a self number, because there is not a number n which added to its sum of digits gives 61015931.

It is not a weakly prime, because it can be changed into another prime (61015939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30507965 + 30507966.

It is an arithmetic number, because the mean of its divisors is an integer number (30507966).

Almost surely, 2^61015931 is an apocalyptic number.

61015931 is a deficient number, since it is larger than the sum of its proper divisors (1).

61015931 is an equidigital number, since it uses as much as digits as its factorization.

61015931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 810, while the sum is 26.

The square root of 61015931 is about 7811.2694870936. The cubic root of 61015931 is about 393.6839843638.

Adding to 61015931 its reverse (13951016), we get a palindrome (74966947).

The spelling of 61015931 in words is "sixty-one million, fifteen thousand, nine hundred thirty-one".