31220401667 has 32 divisors (see below), whose sum is σ = 39037724544. Its totient is φ = 24310886400.

The previous prime is 31220401649. The next prime is 31220401669. The reversal of 31220401667 is 76610402213.

It is a cyclic number.

It is not a de Polignac number, because 31220401667 - 2²⁰ = 31219353091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31220401669) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1587917 + ... + 1607457.

It is an arithmetic number, because the mean of its divisors is an integer number (1219928892).

Almost surely, 2^31220401667 is an apocalyptic number.

31220401667 is a deficient number, since it is larger than the sum of its proper divisors (7817322877).

31220401667 is a wasteful number, since it uses less digits than its factorization.

31220401667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19839.

The product of its (nonzero) digits is 12096, while the sum is 32.

The spelling of 31220401667 in words is "thirty-one billion, two hundred twenty million, four hundred one thousand, six hundred sixty-seven".