31657093 has 4 divisors (see below), whose sum is σ = 34092268. Its totient is φ = 29221920.

The previous prime is 31657091. The next prime is 31657103. The reversal of 31657093 is 39075613.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39075613 = 619 ⋅63127.

It can be written as a sum of positive squares in 2 ways, for example, as 2259009 + 29398084 = 1503^2 + 5422^2 .

It is not a de Polignac number, because 31657093 - 2¹ = 31657091 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31657091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1217568 + ... + 1217593.

It is an arithmetic number, because the mean of its divisors is an integer number (8523067).

Almost surely, 2^31657093 is an apocalyptic number.

It is an amenable number.

31657093 is a deficient number, since it is larger than the sum of its proper divisors (2435175).

31657093 is a wasteful number, since it uses less digits than its factorization.

31657093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2435174.

The product of its (nonzero) digits is 17010, while the sum is 34.

The square root of 31657093 is about 5626.4636318028. The cubic root of 31657093 is about 316.3421126590.

The spelling of 31657093 in words is "thirty-one million, six hundred fifty-seven thousand, ninety-three".