31244257243 has 4 divisors (see below), whose sum is σ = 31320649480. Its totient is φ = 31167865008.

The previous prime is 31244257237. The next prime is 31244257283. The reversal of 31244257243 is 34275244213.

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 31244257243 - 2⁹ = 31244256731 is a prime.

It is a super-2 number, since 2×31244257243² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31244257223) 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, 38195505 + ... + 38196322.

It is an arithmetic number, because the mean of its divisors is an integer number (7830162370).

Almost surely, 2^31244257243 is an apocalyptic number.

31244257243 is a deficient number, since it is larger than the sum of its proper divisors (76392237).

31244257243 is an equidigital number, since it uses as much as digits as its factorization.

31244257243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76392236.

The product of its digits is 161280, while the sum is 37.

The spelling of 31244257243 in words is "thirty-one billion, two hundred forty-four million, two hundred fifty-seven thousand, two hundred forty-three".