117552991 has 4 divisors (see below), whose sum is σ = 118716984. Its totient is φ = 116389000.

The previous prime is 117552989. The next prime is 117552997. The reversal of 117552991 is 199255711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 199255711 = 331 ⋅601981.

It is a cyclic number.

It is not a de Polignac number, because 117552991 - 2¹ = 117552989 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 (117552997) 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, 581845 + ... + 582046.

It is an arithmetic number, because the mean of its divisors is an integer number (29679246).

Almost surely, 2^117552991 is an apocalyptic number.

117552991 is a deficient number, since it is larger than the sum of its proper divisors (1163993).

117552991 is a wasteful number, since it uses less digits than its factorization.

117552991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1163992.

The product of its digits is 28350, while the sum is 40.

The square root of 117552991 is about 10842.1857113776. The cubic root of 117552991 is about 489.8666734301.

The spelling of 117552991 in words is "one hundred seventeen million, five hundred fifty-two thousand, nine hundred ninety-one".