117297251 has 4 divisors (see below), whose sum is σ = 119285400. Its totient is φ = 115309104.

The previous prime is 117297247. The next prime is 117297281. The reversal of 117297251 is 152792711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 152792711 = 881 ⋅173431.

It is a cyclic number.

It is not a de Polignac number, because 117297251 - 2² = 117297247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117297281) 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, 993986 + ... + 994103.

It is an arithmetic number, because the mean of its divisors is an integer number (29821350).

Almost surely, 2^117297251 is an apocalyptic number.

117297251 is a deficient number, since it is larger than the sum of its proper divisors (1988149).

117297251 is an equidigital number, since it uses as much as digits as its factorization.

117297251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1988148.

The product of its digits is 8820, while the sum is 35.

The square root of 117297251 is about 10830.3855425373. The cubic root of 117297251 is about 489.5111757066.

The spelling of 117297251 in words is "one hundred seventeen million, two hundred ninety-seven thousand, two hundred fifty-one".