31021093 has 2 divisors, whose sum is σ = 31021094. Its totient is φ = 31021092.

The previous prime is 31021087. The next prime is 31021127. The reversal of 31021093 is 39012013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30669444 + 351649 = 5538^2 + 593^2 .

It is a cyclic number.

It is not a de Polignac number, because 31021093 - 2⁵ = 31021061 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31021093.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31021013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15510546 + 15510547.

It is an arithmetic number, because the mean of its divisors is an integer number (15510547).

Almost surely, 2^31021093 is an apocalyptic number.

It is an amenable number.

31021093 is a deficient number, since it is larger than the sum of its proper divisors (1).

31021093 is an equidigital number, since it uses as much as digits as its factorization.

31021093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 31021093 is about 5569.6582480436. The cubic root of 31021093 is about 314.2092976255.

The spelling of 31021093 in words is "thirty-one million, twenty-one thousand, ninety-three".