31166421 has 16 divisors (see below), whose sum is σ = 48820800. Its totient is φ = 17435520.

The previous prime is 31166413. The next prime is 31166453. The reversal of 31166421 is 12466113.

It is not a de Polignac number, because 31166421 - 2³ = 31166413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31166391 and 31166400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31166411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35896 + ... + 36753.

It is an arithmetic number, because the mean of its divisors is an integer number (3051300).

Almost surely, 2^31166421 is an apocalyptic number.

It is an amenable number.

31166421 is a deficient number, since it is larger than the sum of its proper divisors (17654379).

31166421 is a wasteful number, since it uses less digits than its factorization.

31166421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72676.

The product of its digits is 864, while the sum is 24.

The square root of 31166421 is about 5582.6894056539. The cubic root of 31166421 is about 314.6992039145.

The spelling of 31166421 in words is "thirty-one million, one hundred sixty-six thousand, four hundred twenty-one".