31920193 has 4 divisors (see below), whose sum is σ = 31933440. Its totient is φ = 31906948.

The previous prime is 31920179. The next prime is 31920211. The reversal of 31920193 is 39102913.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31920193 - 2²¹ = 29823041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31920143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1873 + ... + 8206.

It is an arithmetic number, because the mean of its divisors is an integer number (7983360).

Almost surely, 2^31920193 is an apocalyptic number.

It is an amenable number.

31920193 is a deficient number, since it is larger than the sum of its proper divisors (13247).

31920193 is a wasteful number, since it uses less digits than its factorization.

31920193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13246.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 31920193 is about 5649.7958370192. The cubic root of 31920193 is about 317.2160621048.

The spelling of 31920193 in words is "thirty-one million, nine hundred twenty thousand, one hundred ninety-three".