61100085731 has 2 divisors, whose sum is σ = 61100085732. Its totient is φ = 61100085730.

The previous prime is 61100085653. The next prime is 61100085743. The reversal of 61100085731 is 13758000116.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61100085731 - 2¹⁰ = 61100084707 is a prime.

It is a super-2 number, since 2×61100085731² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (61100085931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30550042865 + 30550042866.

It is an arithmetic number, because the mean of its divisors is an integer number (30550042866).

Almost surely, 2^61100085731 is an apocalyptic number.

61100085731 is a deficient number, since it is larger than the sum of its proper divisors (1).

61100085731 is an equidigital number, since it uses as much as digits as its factorization.

61100085731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 32.

Adding to 61100085731 its reverse (13758000116), we get a palindrome (74858085847).

The spelling of 61100085731 in words is "sixty-one billion, one hundred million, eighty-five thousand, seven hundred thirty-one".