31909853 has 2 divisors, whose sum is σ = 31909854. Its totient is φ = 31909852.

The previous prime is 31909841. The next prime is 31909879. The reversal of 31909853 is 35890913.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22534009 + 9375844 = 4747^2 + 3062^2 .

It is an emirp because it is prime and its reverse (35890913) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31909853 - 2⁴ = 31909837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31909883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15954926 + 15954927.

It is an arithmetic number, because the mean of its divisors is an integer number (15954927).

Almost surely, 2^31909853 is an apocalyptic number.

It is an amenable number.

31909853 is a deficient number, since it is larger than the sum of its proper divisors (1).

31909853 is an equidigital number, since it uses as much as digits as its factorization.

31909853 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 31909853 is about 5648.8806855872. The cubic root of 31909853 is about 317.1818061683.

The spelling of 31909853 in words is "thirty-one million, nine hundred nine thousand, eight hundred fifty-three".