31402249 has 2 divisors, whose sum is σ = 31402250. Its totient is φ = 31402248.

The previous prime is 31402243. The next prime is 31402271. The reversal of 31402249 is 94220413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30691600 + 710649 = 5540^2 + 843^2 .

It is a cyclic number.

It is not a de Polignac number, because 31402249 - 2⁷ = 31402121 is a prime.

It is a super-2 number, since 2×31402249² = 1972202484516002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31402243) 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 as a sum of consecutive naturals, namely, 15701124 + 15701125.

It is an arithmetic number, because the mean of its divisors is an integer number (15701125).

Almost surely, 2^31402249 is an apocalyptic number.

It is an amenable number.

31402249 is a deficient number, since it is larger than the sum of its proper divisors (1).

31402249 is an equidigital number, since it uses as much as digits as its factorization.

31402249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 31402249 is about 5603.7709624859. The cubic root of 31402249 is about 315.4909585909.

The spelling of 31402249 in words is "thirty-one million, four hundred two thousand, two hundred forty-nine".