31404031 has 4 divisors (see below), whose sum is σ = 31715064. Its totient is φ = 31093000.

The previous prime is 31404011. The next prime is 31404047. The reversal of 31404031 is 13040413.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13040413 = 101 ⋅129113.

It is a cyclic number.

It is not a de Polignac number, because 31404031 - 2¹⁹ = 30879743 is a prime.

It is a super-2 number, since 2×31404031² = 1972426326097922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31403996 and 31404014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31404011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155365 + ... + 155566.

It is an arithmetic number, because the mean of its divisors is an integer number (7928766).

Almost surely, 2^31404031 is an apocalyptic number.

31404031 is a deficient number, since it is larger than the sum of its proper divisors (311033).

31404031 is a wasteful number, since it uses less digits than its factorization.

31404031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311032.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 31404031 is about 5603.9299603046. The cubic root of 31404031 is about 315.4969262553.

Adding to 31404031 its reverse (13040413), we get a palindrome (44444444).

The spelling of 31404031 in words is "thirty-one million, four hundred four thousand, thirty-one".