31131403 has 8 divisors (see below), whose sum is σ = 33060960. Its totient is φ = 29212800.

The previous prime is 31131379. The next prime is 31131407. The reversal of 31131403 is 30413113.

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

It is not a de Polignac number, because 31131403 - 2²¹ = 29034251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31131407) 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, 3553 + ... + 8653.

It is an arithmetic number, because the mean of its divisors is an integer number (4132620).

Almost surely, 2^31131403 is an apocalyptic number.

31131403 is a deficient number, since it is larger than the sum of its proper divisors (1929557).

31131403 is a wasteful number, since it uses less digits than its factorization.

31131403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5477.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 31131403 is about 5579.5522221770. The cubic root of 31131403 is about 314.5812963900.

Adding to 31131403 its reverse (30413113), we get a palindrome (61544516).

The spelling of 31131403 in words is "thirty-one million, one hundred thirty-one thousand, four hundred three".