31405369 has 2 divisors, whose sum is σ = 31405370. Its totient is φ = 31405368.

The previous prime is 31405357. The next prime is 31405411. The reversal of 31405369 is 96350413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31360000 + 45369 = 5600^2 + 213^2 .

It is a cyclic number.

It is not a de Polignac number, because 31405369 - 2¹¹ = 31403321 is a prime.

It is a super-2 number, since 2×31405369² = 1972594404052322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31405369.

It is not a weakly prime, because it can be changed into another prime (31405349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15702684 + 15702685.

It is an arithmetic number, because the mean of its divisors is an integer number (15702685).

Almost surely, 2^31405369 is an apocalyptic number.

It is an amenable number.

31405369 is a deficient number, since it is larger than the sum of its proper divisors (1).

31405369 is an equidigital number, since it uses as much as digits as its factorization.

31405369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 31405369 is about 5604.0493395401. The cubic root of 31405369 is about 315.5014068785.

The spelling of 31405369 in words is "thirty-one million, four hundred five thousand, three hundred sixty-nine".