61100031997 has 4 divisors (see below), whose sum is σ = 61175371936. Its totient is φ = 61024692060.

The previous prime is 61100031961. The next prime is 61100032039. The reversal of 61100031997 is 79913000116.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61100031997 - 2¹⁹ = 61099507709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61100031917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37668753 + ... + 37670374.

It is an arithmetic number, because the mean of its divisors is an integer number (15293842984).

Almost surely, 2^61100031997 is an apocalyptic number.

It is an amenable number.

61100031997 is a deficient number, since it is larger than the sum of its proper divisors (75339939).

61100031997 is an equidigital number, since it uses as much as digits as its factorization.

61100031997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75339938.

The product of its (nonzero) digits is 10206, while the sum is 37.

The spelling of 61100031997 in words is "sixty-one billion, one hundred million, thirty-one thousand, nine hundred ninety-seven".