31243057 has 4 divisors (see below), whose sum is σ = 31257700. Its totient is φ = 31228416.

The previous prime is 31243013. The next prime is 31243061. The reversal of 31243057 is 75034213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75034213 = 101 ⋅742913.

It can be written as a sum of positive squares in 2 ways, for example, as 20214016 + 11029041 = 4496^2 + 3321^2 .

It is a cyclic number.

It is not a de Polignac number, because 31243057 - 2²³ = 22854449 is a prime.

It is a super-2 number, since 2×31243057² = 1952257221410498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31243007) 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, 3432 + ... + 8617.

It is an arithmetic number, because the mean of its divisors is an integer number (7814425).

Almost surely, 2^31243057 is an apocalyptic number.

It is an amenable number.

31243057 is a deficient number, since it is larger than the sum of its proper divisors (14643).

31243057 is a wasteful number, since it uses less digits than its factorization.

31243057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14642.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 31243057 is about 5589.5489084541. The cubic root of 31243057 is about 314.9569337277.

The spelling of 31243057 in words is "thirty-one million, two hundred forty-three thousand, fifty-seven".