117357521 has 4 divisors (see below), whose sum is σ = 117728052. Its totient is φ = 116986992.

The previous prime is 117357517. The next prime is 117357557. The reversal of 117357521 is 125753711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 125753711 = 10853 ⋅11587.

It can be written as a sum of positive squares in 2 ways, for example, as 64577296 + 52780225 = 8036^2 + 7265^2 .

It is a cyclic number.

It is not a de Polignac number, because 117357521 - 2² = 117357517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117357571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 184790 + ... + 185423.

It is an arithmetic number, because the mean of its divisors is an integer number (29432013).

Almost surely, 2^117357521 is an apocalyptic number.

It is an amenable number.

117357521 is a deficient number, since it is larger than the sum of its proper divisors (370531).

117357521 is an equidigital number, since it uses as much as digits as its factorization.

117357521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370530.

The product of its digits is 7350, while the sum is 32.

The square root of 117357521 is about 10833.1676346302. The cubic root of 117357521 is about 489.5950020159.

The spelling of 117357521 in words is "one hundred seventeen million, three hundred fifty-seven thousand, five hundred twenty-one".