117215561 has 4 divisors (see below), whose sum is σ = 124110612. Its totient is φ = 110320512.

The previous prime is 117215551. The next prime is 117215563. The reversal of 117215561 is 165512711.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 45981961 + 71233600 = 6781^2 + 8440^2 .

It is a cyclic number.

It is not a de Polignac number, because 117215561 - 2²⁶ = 50106697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117215563) 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, 3447500 + ... + 3447533.

It is an arithmetic number, because the mean of its divisors is an integer number (31027653).

Almost surely, 2^117215561 is an apocalyptic number.

It is an amenable number.

117215561 is a deficient number, since it is larger than the sum of its proper divisors (6895051).

117215561 is an equidigital number, since it uses as much as digits as its factorization.

117215561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6895050.

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

The square root of 117215561 is about 10826.6135517991. The cubic root of 117215561 is about 489.3975116203.

The spelling of 117215561 in words is "one hundred seventeen million, two hundred fifteen thousand, five hundred sixty-one".