31357093 has 8 divisors (see below), whose sum is σ = 32540312. Its totient is φ = 30191616.

The previous prime is 31357069. The next prime is 31357097. The reversal of 31357093 is 39075313.

It can be written as a sum of positive squares in 4 ways, for example, as 8105409 + 23251684 = 2847^2 + 4822^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31357093 - 2⁹ = 31356581 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 (31357097) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 780 + ... + 7957.

It is an arithmetic number, because the mean of its divisors is an integer number (4067539).

Almost surely, 2^31357093 is an apocalyptic number.

It is an amenable number.

31357093 is a deficient number, since it is larger than the sum of its proper divisors (1183219).

31357093 is an equidigital number, since it uses as much as digits as its factorization.

31357093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8871.

The product of its (nonzero) digits is 8505, while the sum is 31.

The square root of 31357093 is about 5599.7404404133. The cubic root of 31357093 is about 315.3396621678.

The spelling of 31357093 in words is "thirty-one million, three hundred fifty-seven thousand, ninety-three".