31995401 has 4 divisors (see below), whose sum is σ = 32128404. Its totient is φ = 31862400.

The previous prime is 31995367. The next prime is 31995443. The reversal of 31995401 is 10459913.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10459913 = 17 ⋅615289.

It can be written as a sum of positive squares in 2 ways, for example, as 20939776 + 11055625 = 4576^2 + 3325^2 .

It is a cyclic number.

It is not a de Polignac number, because 31995401 - 2¹⁰ = 31994377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31995451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66140 + ... + 66621.

It is an arithmetic number, because the mean of its divisors is an integer number (8032101).

Almost surely, 2^31995401 is an apocalyptic number.

It is an amenable number.

31995401 is a deficient number, since it is larger than the sum of its proper divisors (133003).

31995401 is a wasteful number, since it uses less digits than its factorization.

31995401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133002.

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 31995401 is about 5656.4477368751. The cubic root of 31995401 is about 317.4650003786.

The spelling of 31995401 in words is "thirty-one million, nine hundred ninety-five thousand, four hundred one".