31220401671 has 16 divisors (see below), whose sum is σ = 46529414400. Its totient is φ = 20688965784.

The previous prime is 31220401669. The next prime is 31220401673. The reversal of 31220401671 is 17610402213.

31220401671 is a `hidden beast` number, since 31 + 220 + 401 + 6 + 7 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (31220401669) and next prime (31220401673).

It is not a de Polignac number, because 31220401671 - 2¹ = 31220401669 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31220401673) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3457501 + ... + 3466518.

It is an arithmetic number, because the mean of its divisors is an integer number (2908088400).

Almost surely, 2^31220401671 is an apocalyptic number.

31220401671 is a deficient number, since it is larger than the sum of its proper divisors (15309012729).

31220401671 is a wasteful number, since it uses less digits than its factorization.

31220401671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6924195 (or 6924189 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

Adding to 31220401671 its reverse (17610402213), we get a palindrome (48830803884).

The spelling of 31220401671 in words is "thirty-one billion, two hundred twenty million, four hundred one thousand, six hundred seventy-one".