31609453 has 2 divisors, whose sum is σ = 31609454. Its totient is φ = 31609452.

The previous prime is 31609451. The next prime is 31609463. The reversal of 31609453 is 35490613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31505769 + 103684 = 5613^2 + 322^2 .

It is a cyclic number.

It is not a de Polignac number, because 31609453 - 2¹ = 31609451 is a prime.

Together with 31609451, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31609451) 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, 15804726 + 15804727.

It is an arithmetic number, because the mean of its divisors is an integer number (15804727).

Almost surely, 2^31609453 is an apocalyptic number.

It is an amenable number.

31609453 is a deficient number, since it is larger than the sum of its proper divisors (1).

31609453 is an equidigital number, since it uses as much as digits as its factorization.

31609453 is an odious number, because the sum of its binary digits is odd.

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

The square root of 31609453 is about 5622.2284727677. The cubic root of 31609453 is about 316.1833477724.

The spelling of 31609453 in words is "thirty-one million, six hundred nine thousand, four hundred fifty-three".