117897477 has 4 divisors (see below), whose sum is σ = 157196640. Its totient is φ = 78598316.

The previous prime is 117897473. The next prime is 117897539. The reversal of 117897477 is 774798711.

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: 774798711 = 3 ⋅258266237.

It is a cyclic number.

It is not a de Polignac number, because 117897477 - 2² = 117897473 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117897473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19649577 + ... + 19649582.

It is an arithmetic number, because the mean of its divisors is an integer number (39299160).

Almost surely, 2^117897477 is an apocalyptic number.

It is an amenable number.

117897477 is a deficient number, since it is larger than the sum of its proper divisors (39299163).

117897477 is an equidigital number, since it uses as much as digits as its factorization.

117897477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39299162.

The product of its digits is 691488, while the sum is 51.

The square root of 117897477 is about 10858.0604621636. The cubic root of 117897477 is about 490.3447206380.

The spelling of 117897477 in words is "one hundred seventeen million, eight hundred ninety-seven thousand, four hundred seventy-seven".