161400923 has 4 divisors (see below), whose sum is σ = 163809960. Its totient is φ = 158991888.

The previous prime is 161400917. The next prime is 161400971. The reversal of 161400923 is 329004161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 329004161 = 1181 ⋅278581.

It is a cyclic number.

It is not a de Polignac number, because 161400923 - 2⁸ = 161400667 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161400892 and 161400901.

It is not an unprimeable number, because it can be changed into a prime (161430923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1204418 + ... + 1204551.

It is an arithmetic number, because the mean of its divisors is an integer number (40952490).

Almost surely, 2^161400923 is an apocalyptic number.

161400923 is a deficient number, since it is larger than the sum of its proper divisors (2409037).

161400923 is an equidigital number, since it uses as much as digits as its factorization.

161400923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2409036.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 161400923 is about 12704.3662966714. The cubic root of 161400923 is about 544.4633755075.

The spelling of 161400923 in words is "one hundred sixty-one million, four hundred thousand, nine hundred twenty-three".