31405116 has 12 divisors (see below), whose sum is σ = 73278632. Its totient is φ = 10468368.

The previous prime is 31405109. The next prime is 31405123. The reversal of 31405116 is 61150413.

It is an interprime number because it is at equal distance from previous prime (31405109) and next prime (31405123).

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 31405092 and 31405101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1308535 + ... + 1308558.

Almost surely, 2^31405116 is an apocalyptic number.

It is an amenable number.

31405116 is an abundant number, since it is smaller than the sum of its proper divisors (41873516).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31405116 is a wasteful number, since it uses less digits than its factorization.

31405116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2617100 (or 2617098 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 31405116 is about 5604.0267665314. The cubic root of 31405116 is about 315.5005596554.

Adding to 31405116 its reverse (61150413), we get a palindrome (92555529).

It can be divided in two parts, 3140 and 5116, that added together give a triangular number (8256 = T₁₂₈).

The spelling of 31405116 in words is "thirty-one million, four hundred five thousand, one hundred sixteen".