31653689 has 2 divisors, whose sum is σ = 31653690. Its totient is φ = 31653688.

The previous prime is 31653659. The next prime is 31653691. The reversal of 31653689 is 98635613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30858025 + 795664 = 5555^2 + 892^2 .

It is a cyclic number.

It is not a de Polignac number, because 31653689 - 2¹² = 31649593 is a prime.

Together with 31653691, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31653619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15826844 + 15826845.

It is an arithmetic number, because the mean of its divisors is an integer number (15826845).

Almost surely, 2^31653689 is an apocalyptic number.

It is an amenable number.

31653689 is a deficient number, since it is larger than the sum of its proper divisors (1).

31653689 is an equidigital number, since it uses as much as digits as its factorization.

31653689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 41.

The square root of 31653689 is about 5626.1611246035. The cubic root of 31653689 is about 316.3307737872.

The spelling of 31653689 in words is "thirty-one million, six hundred fifty-three thousand, six hundred eighty-nine".