31486621 has 6 divisors (see below), whose sum is σ = 32237790. Its totient is φ = 30752568.

The previous prime is 31486613. The next prime is 31486627. The reversal of 31486621 is 12668413.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 29822521 + 1664100 = 5461^2 + 1290^2 .

It is not a de Polignac number, because 31486621 - 2³ = 31486613 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31486627) 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 5 ways as a sum of consecutive naturals, for example, 6666 + ... + 10363.

It is an arithmetic number, because the mean of its divisors is an integer number (5372965).

Almost surely, 2^31486621 is an apocalyptic number.

It is an amenable number.

31486621 is a deficient number, since it is larger than the sum of its proper divisors (751169).

31486621 is an equidigital number, since it uses as much as digits as its factorization.

31486621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17115 (or 17072 counting only the distinct ones).

The product of its digits is 6912, while the sum is 31.

The square root of 31486621 is about 5611.2940575236. The cubic root of 31486621 is about 315.7732610775.

The spelling of 31486621 in words is "thirty-one million, four hundred eighty-six thousand, six hundred twenty-one".