117257431 has 4 divisors (see below), whose sum is σ = 119984392. Its totient is φ = 114530472.

The previous prime is 117257419. The next prime is 117257443. The reversal of 117257431 is 134752711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134752711 = 2243 ⋅60077.

It is an interprime number because it is at equal distance from previous prime (117257419) and next prime (117257443).

It is a cyclic number.

It is not a de Polignac number, because 117257431 - 2¹⁹ = 116733143 is a prime.

It is a super-2 number, since 2×117257431² = 27498610249439522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 117257393 and 117257402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117257401) 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, 1363416 + ... + 1363501.

It is an arithmetic number, because the mean of its divisors is an integer number (29996098).

Almost surely, 2^117257431 is an apocalyptic number.

117257431 is a deficient number, since it is larger than the sum of its proper divisors (2726961).

117257431 is an equidigital number, since it uses as much as digits as its factorization.

117257431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2726960.

The product of its digits is 5880, while the sum is 31.

The square root of 117257431 is about 10828.5470401158. The cubic root of 117257431 is about 489.4557764510.

The spelling of 117257431 in words is "one hundred seventeen million, two hundred fifty-seven thousand, four hundred thirty-one".