117157261 has 4 divisors (see below), whose sum is σ = 126169372. Its totient is φ = 108145152.

The previous prime is 117157259. The next prime is 117157283. The reversal of 117157261 is 162751711.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 162751711 = 53 ⋅3070787.

It can be written as a sum of positive squares in 2 ways, for example, as 64304361 + 52852900 = 8019^2 + 7270^2 .

It is a cyclic number.

It is not a de Polignac number, because 117157261 - 2¹ = 117157259 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117151261) 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, 4506036 + ... + 4506061.

It is an arithmetic number, because the mean of its divisors is an integer number (31542343).

Almost surely, 2^117157261 is an apocalyptic number.

It is an amenable number.

117157261 is a deficient number, since it is larger than the sum of its proper divisors (9012111).

117157261 is an equidigital number, since it uses as much as digits as its factorization.

117157261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9012110.

The product of its digits is 2940, while the sum is 31.

The square root of 117157261 is about 10823.9207776110. The cubic root of 117157261 is about 489.3163602603.

The spelling of 117157261 in words is "one hundred seventeen million, one hundred fifty-seven thousand, two hundred sixty-one".