31408169 has 4 divisors (see below), whose sum is σ = 33824196. Its totient is φ = 28992144.

The previous prime is 31408147. The next prime is 31408211. The reversal of 31408169 is 96180413.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6528025 + 24880144 = 2555^2 + 4988^2 .

It is a cyclic number.

It is not a de Polignac number, because 31408169 - 2⁸ = 31407913 is a prime.

It is a super-2 number, since 2×31408169² = 1972946159865122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31428169) 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, 1207994 + ... + 1208019.

It is an arithmetic number, because the mean of its divisors is an integer number (8456049).

Almost surely, 2^31408169 is an apocalyptic number.

It is an amenable number.

31408169 is a deficient number, since it is larger than the sum of its proper divisors (2416027).

31408169 is a wasteful number, since it uses less digits than its factorization.

31408169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2416026.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 31408169 is about 5604.2991533286. The cubic root of 31408169 is about 315.5107829578.

The spelling of 31408169 in words is "thirty-one million, four hundred eight thousand, one hundred sixty-nine".