31243457 has 4 divisors (see below), whose sum is σ = 35706816. Its totient is φ = 26780100.

The previous prime is 31243439. The next prime is 31243463. The reversal of 31243457 is 75434213.

It is a happy number.

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 31243457 - 2⁶ = 31243393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31243417) 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, 2231669 + ... + 2231682.

It is an arithmetic number, because the mean of its divisors is an integer number (8926704).

Almost surely, 2^31243457 is an apocalyptic number.

It is an amenable number.

31243457 is a deficient number, since it is larger than the sum of its proper divisors (4463359).

31243457 is an equidigital number, since it uses as much as digits as its factorization.

31243457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4463358.

The product of its digits is 10080, while the sum is 29.

The square root of 31243457 is about 5589.5846894022. The cubic root of 31243457 is about 314.9582778368.

The spelling of 31243457 in words is "thirty-one million, two hundred forty-three thousand, four hundred fifty-seven".