31480621 has 2 divisors, whose sum is σ = 31480622. Its totient is φ = 31480620.

The previous prime is 31480529. The next prime is 31480639. The reversal of 31480621 is 12608413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27678121 + 3802500 = 5261^2 + 1950^2 .

It is a cyclic number.

It is not a de Polignac number, because 31480621 - 2¹⁵ = 31447853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31480681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15740310 + 15740311.

It is an arithmetic number, because the mean of its divisors is an integer number (15740311).

Almost surely, 2^31480621 is an apocalyptic number.

It is an amenable number.

31480621 is a deficient number, since it is larger than the sum of its proper divisors (1).

31480621 is an equidigital number, since it uses as much as digits as its factorization.

31480621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 31480621 is about 5610.7593960176. The cubic root of 31480621 is about 315.7532021883.

The spelling of 31480621 in words is "thirty-one million, four hundred eighty thousand, six hundred twenty-one".