117849521 has 4 divisors (see below), whose sum is σ = 119463972. Its totient is φ = 116235072.

The previous prime is 117849517. The next prime is 117849577. The reversal of 117849521 is 125948711.

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 65431921 + 52417600 = 8089^2 + 7240^2 .

It is a cyclic number.

It is not a de Polignac number, because 117849521 - 2² = 117849517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (117839521) 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, 807116 + ... + 807261.

It is an arithmetic number, because the mean of its divisors is an integer number (29865993).

Almost surely, 2^117849521 is an apocalyptic number.

It is an amenable number.

117849521 is a deficient number, since it is larger than the sum of its proper divisors (1614451).

117849521 is an equidigital number, since it uses as much as digits as its factorization.

117849521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1614450.

The product of its digits is 20160, while the sum is 38.

The square root of 117849521 is about 10855.8519241928. The cubic root of 117849521 is about 490.2782273845.

The spelling of 117849521 in words is "one hundred seventeen million, eight hundred forty-nine thousand, five hundred twenty-one".