117920521 has 4 divisors (see below), whose sum is σ = 118369152. Its totient is φ = 117471892.

The previous prime is 117920519. The next prime is 117920531. The reversal of 117920521 is 125029711.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 125029711 = 2963 ⋅42197.

It is a cyclic number.

It is not a de Polignac number, because 117920521 - 2¹ = 117920519 is a prime.

It is a super-2 number, since 2×117920521² = 27810498545822882, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 117920521.

It is not an unprimeable number, because it can be changed into a prime (117920531) 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, 223921 + ... + 224446.

It is an arithmetic number, because the mean of its divisors is an integer number (29592288).

Almost surely, 2^117920521 is an apocalyptic number.

It is an amenable number.

117920521 is a deficient number, since it is larger than the sum of its proper divisors (448631).

117920521 is an equidigital number, since it uses as much as digits as its factorization.

117920521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448630.

The product of its (nonzero) digits is 1260, while the sum is 28.

The square root of 117920521 is about 10859.1215574742. The cubic root of 117920521 is about 490.3766658159.

The spelling of 117920521 in words is "one hundred seventeen million, nine hundred twenty thousand, five hundred twenty-one".