117561251 has 4 divisors (see below), whose sum is σ = 117618600. Its totient is φ = 117503904.

The previous prime is 117561209. The next prime is 117561253. The reversal of 117561251 is 152165711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 152165711 = 103 ⋅1477337.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-117561251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117561253) 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, 25481 + ... + 29738.

It is an arithmetic number, because the mean of its divisors is an integer number (29404650).

Almost surely, 2^117561251 is an apocalyptic number.

117561251 is a deficient number, since it is larger than the sum of its proper divisors (57349).

117561251 is an equidigital number, since it uses as much as digits as its factorization.

117561251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57348.

The product of its digits is 2100, while the sum is 29.

The square root of 117561251 is about 10842.5666241900. The cubic root of 117561251 is about 489.8781468485.

It can be divided in two parts, 1175 and 61251, that added together give a palindrome (62426).

The spelling of 117561251 in words is "one hundred seventeen million, five hundred sixty-one thousand, two hundred fifty-one".