31201431 has 8 divisors (see below), whose sum is σ = 42223104. Its totient is φ = 20490360.

The previous prime is 31201411. The next prime is 31201433. The reversal of 31201431 is 13410213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31201431 - 2⁵ = 31201399 is a prime.

It is a super-2 number, since 2×31201431² = 1947058592895522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31201431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31201433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77415 + ... + 77816.

It is an arithmetic number, because the mean of its divisors is an integer number (5277888).

Almost surely, 2^31201431 is an apocalyptic number.

31201431 is a deficient number, since it is larger than the sum of its proper divisors (11021673).

31201431 is a wasteful number, since it uses less digits than its factorization.

31201431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155301.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 31201431 is about 5585.8241110869. The cubic root of 31201431 is about 314.8169962467.

Adding to 31201431 its reverse (13410213), we get a palindrome (44611644).

The spelling of 31201431 in words is "thirty-one million, two hundred one thousand, four hundred thirty-one".