31901986409 has 4 divisors (see below), whose sum is σ = 31957857360. Its totient is φ = 31846115460.

The previous prime is 31901986393. The next prime is 31901986421. The reversal of 31901986409 is 90468910913.

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 31901986409 - 2⁴ = 31901986393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31901986439) 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, 27934619 + ... + 27935760.

It is an arithmetic number, because the mean of its divisors is an integer number (7989464340).

Almost surely, 2^31901986409 is an apocalyptic number.

It is an amenable number.

31901986409 is a deficient number, since it is larger than the sum of its proper divisors (55870951).

31901986409 is an equidigital number, since it uses as much as digits as its factorization.

31901986409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55870950.

The product of its (nonzero) digits is 419904, while the sum is 50.

The spelling of 31901986409 in words is "thirty-one billion, nine hundred one million, nine hundred eighty-six thousand, four hundred nine".