117861457 has 4 divisors (see below), whose sum is σ = 134698816. Its totient is φ = 101024100.

The previous prime is 117861439. The next prime is 117861467. The reversal of 117861457 is 754168711.

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, and also an emirpimes, since its reverse is a distinct semiprime: 754168711 = 109 ⋅6918979.

It is a cyclic number.

It is not a de Polignac number, because 117861457 - 2²³ = 109472849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (117861467) 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, 8418669 + ... + 8418682.

It is an arithmetic number, because the mean of its divisors is an integer number (33674704).

Almost surely, 2^117861457 is an apocalyptic number.

It is an amenable number.

117861457 is a deficient number, since it is larger than the sum of its proper divisors (16837359).

117861457 is an equidigital number, since it uses as much as digits as its factorization.

117861457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16837358.

The product of its digits is 47040, while the sum is 40.

The square root of 117861457 is about 10856.4016598503. The cubic root of 117861457 is about 490.2947788967.

The spelling of 117861457 in words is "one hundred seventeen million, eight hundred sixty-one thousand, four hundred fifty-seven".