31306401 has 24 divisors (see below), whose sum is σ = 54722304. Its totient is φ = 16836480.

The previous prime is 31306393. The next prime is 31306417. The reversal of 31306401 is 10460313.

It is not a de Polignac number, because 31306401 - 2³ = 31306393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31306421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13545 + ... + 15686.

It is an arithmetic number, because the mean of its divisors is an integer number (2280096).

Almost surely, 2^31306401 is an apocalyptic number.

It is an amenable number.

31306401 is a deficient number, since it is larger than the sum of its proper divisors (23415903).

31306401 is a wasteful number, since it uses less digits than its factorization.

31306401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29261 (or 29258 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 31306401 is about 5595.2123284108. The cubic root of 31306401 is about 315.1696440711.

Adding to 31306401 its reverse (10460313), we get a palindrome (41766714).

The spelling of 31306401 in words is "thirty-one million, three hundred six thousand, four hundred one".