161423361 has 40 divisors (see below), whose sum is σ = 274532544. Its totient is φ = 93566880.

The previous prime is 161423329. The next prime is 161423387. The reversal of 161423361 is 163324161.

It is not a de Polignac number, because 161423361 - 2⁵ = 161423329 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (161423461) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 16555 + ... + 24431.

Almost surely, 2^161423361 is an apocalyptic number.

161423361 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

161423361 is a deficient number, since it is larger than the sum of its proper divisors (113109183).

161423361 is a wasteful number, since it uses less digits than its factorization.

161423361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7923 (or 7914 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 161423361 is about 12705.2493482025. The cubic root of 161423361 is about 544.4886048204.

It can be divided in two parts, 16142 and 3361, that added together give a triangular number (19503 = T₁₉₇).

The spelling of 161423361 in words is "one hundred sixty-one million, four hundred twenty-three thousand, three hundred sixty-one".