161923826 has 4 divisors (see below), whose sum is σ = 242885742. Its totient is φ = 80961912.

The previous prime is 161923781. The next prime is 161923843. The reversal of 161923826 is 628329161.

It is a happy number.

161923826 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 127125625 + 34798201 = 11275^2 + 5899^2 .

It is a super-3 number, since 3×161923826³ (a number of 26 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161923826.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40480955 + ... + 40480958.

Almost surely, 2^161923826 is an apocalyptic number.

161923826 is a deficient number, since it is larger than the sum of its proper divisors (80961916).

161923826 is an equidigital number, since it uses as much as digits as its factorization.

161923826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80961915.

The product of its digits is 31104, while the sum is 38.

The square root of 161923826 is about 12724.9293121809. The cubic root of 161923826 is about 545.0507216492.

The spelling of 161923826 in words is "one hundred sixty-one million, nine hundred twenty-three thousand, eight hundred twenty-six".