117529421 has 4 divisors (see below), whose sum is σ = 123715200. Its totient is φ = 111343644.

The previous prime is 117529403. The next prime is 117529439. The reversal of 117529421 is 124925711.

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: 124925711 = 179 ⋅697909.

It is an interprime number because it is at equal distance from previous prime (117529403) and next prime (117529439).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-117529421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117522421) 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, 3092861 + ... + 3092898.

It is an arithmetic number, because the mean of its divisors is an integer number (30928800).

Almost surely, 2^117529421 is an apocalyptic number.

It is an amenable number.

117529421 is a deficient number, since it is larger than the sum of its proper divisors (6185779).

117529421 is an equidigital number, since it uses as much as digits as its factorization.

117529421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6185778.

The product of its digits is 5040, while the sum is 32.

The square root of 117529421 is about 10841.0986989327. The cubic root of 117529421 is about 489.8339309504.

The spelling of 117529421 in words is "one hundred seventeen million, five hundred twenty-nine thousand, four hundred twenty-one".