31375243 has 4 divisors (see below), whose sum is σ = 32739408. Its totient is φ = 30011080.

The previous prime is 31375231. The next prime is 31375249. The reversal of 31375243 is 34257313.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31375243 - 2⁹ = 31374731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31375249) 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, 682048 + ... + 682093.

It is an arithmetic number, because the mean of its divisors is an integer number (8184852).

Almost surely, 2^31375243 is an apocalyptic number.

31375243 is a deficient number, since it is larger than the sum of its proper divisors (1364165).

31375243 is a wasteful number, since it uses less digits than its factorization.

31375243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1364164.

The product of its digits is 7560, while the sum is 28.

The square root of 31375243 is about 5601.3608168016. The cubic root of 31375243 is about 315.4004916900.

The spelling of 31375243 in words is "thirty-one million, three hundred seventy-five thousand, two hundred forty-three".