161894923 has 2 divisors, whose sum is σ = 161894924. Its totient is φ = 161894922.

The previous prime is 161894911. The next prime is 161894933. The reversal of 161894923 is 329498161.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161894923 - 2⁵ = 161894891 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 161894923.

It is not a weakly prime, because it can be changed into another prime (161894933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80947461 + 80947462.

It is an arithmetic number, because the mean of its divisors is an integer number (80947462).

Almost surely, 2^161894923 is an apocalyptic number.

161894923 is a deficient number, since it is larger than the sum of its proper divisors (1).

161894923 is an equidigital number, since it uses as much as digits as its factorization.

161894923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 43.

The square root of 161894923 is about 12723.7935773888. The cubic root of 161894923 is about 545.0182896536.

It can be divided in two parts, 16189 and 4923, that added together give a palindrome (21112).

The spelling of 161894923 in words is "one hundred sixty-one million, eight hundred ninety-four thousand, nine hundred twenty-three".