31403969 has 2 divisors, whose sum is σ = 31403970. Its totient is φ = 31403968.

The previous prime is 31403921. The next prime is 31404007. The reversal of 31403969 is 96930413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27962944 + 3441025 = 5288^2 + 1855^2 .

It is a cyclic number.

It is not a de Polignac number, because 31403969 - 2¹² = 31399873 is a prime.

It is a super-2 number, since 2×31403969² = 1972418537905922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31403069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15701984 + 15701985.

It is an arithmetic number, because the mean of its divisors is an integer number (15701985).

Almost surely, 2^31403969 is an apocalyptic number.

It is an amenable number.

31403969 is a deficient number, since it is larger than the sum of its proper divisors (1).

31403969 is an equidigital number, since it uses as much as digits as its factorization.

31403969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 35.

The square root of 31403969 is about 5603.9244284697. The cubic root of 31403969 is about 315.4967186299.

The spelling of 31403969 in words is "thirty-one million, four hundred three thousand, nine hundred sixty-nine".