31993785601 has 4 divisors (see below), whose sum is σ = 32238013104. Its totient is φ = 31749558100.

The previous prime is 31993785589. The next prime is 31993785671. The reversal of 31993785601 is 10658739913.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-31993785601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31993785671) 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, 122113555 + ... + 122113816.

It is an arithmetic number, because the mean of its divisors is an integer number (8059503276).

Almost surely, 2^31993785601 is an apocalyptic number.

It is an amenable number.

31993785601 is a deficient number, since it is larger than the sum of its proper divisors (244227503).

31993785601 is a wasteful number, since it uses less digits than its factorization.

31993785601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244227502.

The product of its (nonzero) digits is 1224720, while the sum is 52.

The spelling of 31993785601 in words is "thirty-one billion, nine hundred ninety-three million, seven hundred eighty-five thousand, six hundred one".