31813201 has 12 divisors (see below), whose sum is σ = 38956080. Its totient is φ = 25832520.

The previous prime is 31813189. The next prime is 31813207. The reversal of 31813201 is 10231813.

It is not a de Polignac number, because 31813201 - 2⁷ = 31813073 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (31813207) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16155 + ... + 18016.

It is an arithmetic number, because the mean of its divisors is an integer number (3246340).

Almost surely, 2^31813201 is an apocalyptic number.

It is an amenable number.

31813201 is a deficient number, since it is larger than the sum of its proper divisors (7142879).

31813201 is a wasteful number, since it uses less digits than its factorization.

31813201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34204 (or 34197 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 31813201 is about 5640.3192285544. The cubic root of 31813201 is about 316.8612441590.

The spelling of 31813201 in words is "thirty-one million, eight hundred thirteen thousand, two hundred one".