31402431 has 16 divisors (see below), whose sum is σ = 47219200. Its totient is φ = 20621304.

The previous prime is 31402409. The next prime is 31402471. The reversal of 31402431 is 13420413.

It is not a de Polignac number, because 31402431 - 2⁶ = 31402367 is a prime.

It is a super-2 number, since 2×31402431² = 1972225345419522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31402471) 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, 6871 + ... + 10488.

It is an arithmetic number, because the mean of its divisors is an integer number (2951200).

Almost surely, 2^31402431 is an apocalyptic number.

31402431 is a deficient number, since it is larger than the sum of its proper divisors (15816769).

31402431 is a wasteful number, since it uses less digits than its factorization.

31402431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17435 (or 17429 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 31402431 is about 5603.7872015272. The cubic root of 31402431 is about 315.4915680933.

Adding to 31402431 its reverse (13420413), we get a palindrome (44822844).

The spelling of 31402431 in words is "thirty-one million, four hundred two thousand, four hundred thirty-one".