61131990994 has 8 divisors (see below), whose sum is σ = 91699056000. Its totient is φ = 30565638996.

The previous prime is 61131990989. The next prime is 61131991013. The reversal of 61131990994 is 49909913116.

61131990994 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180507 + ... + 393505.

It is an arithmetic number, because the mean of its divisors is an integer number (11462382000).

Almost surely, 2^61131990994 is an apocalyptic number.

61131990994 is a deficient number, since it is larger than the sum of its proper divisors (30567065006).

61131990994 is a wasteful number, since it uses less digits than its factorization.

61131990994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356504.

The product of its (nonzero) digits is 472392, while the sum is 52.

The spelling of 61131990994 in words is "sixty-one billion, one hundred thirty-one million, nine hundred ninety thousand, nine hundred ninety-four".