117721445 has 4 divisors (see below), whose sum is σ = 141265740. Its totient is φ = 94177152.

The previous prime is 117721441. The next prime is 117721453. The reversal of 117721445 is 544127711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 544127711 = 521 ⋅1044391.

It can be written as a sum of positive squares in 2 ways, for example, as 27888961 + 89832484 = 5281^2 + 9478^2 .

It is a cyclic number.

It is not a de Polignac number, because 117721445 - 2² = 117721441 is a prime.

It is a super-2 number, since 2×117721445² = 27716677225776050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117721441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11772140 + ... + 11772149.

It is an arithmetic number, because the mean of its divisors is an integer number (35316435).

Almost surely, 2^117721445 is an apocalyptic number.

It is an amenable number.

117721445 is a deficient number, since it is larger than the sum of its proper divisors (23544295).

117721445 is an equidigital number, since it uses as much as digits as its factorization.

117721445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23544294.

The product of its digits is 7840, while the sum is 32.

The square root of 117721445 is about 10849.9513823796. The cubic root of 117721445 is about 490.1005555119.

It can be divided in two parts, 1177 and 21445, that added together give a palindrome (22622).

The spelling of 117721445 in words is "one hundred seventeen million, seven hundred twenty-one thousand, four hundred forty-five".