161423493 has 24 divisors (see below), whose sum is σ = 273134880. Its totient is φ = 83855520.

The previous prime is 161423491. The next prime is 161423527. The reversal of 161423493 is 394324161.

It is not a de Polignac number, because 161423493 - 2¹ = 161423491 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161423491) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48298 + ... + 51531.

It is an arithmetic number, because the mean of its divisors is an integer number (11380620).

Almost surely, 2^161423493 is an apocalyptic number.

It is an amenable number.

161423493 is a deficient number, since it is larger than the sum of its proper divisors (111711387).

161423493 is a wasteful number, since it uses less digits than its factorization.

161423493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99857 (or 99850 counting only the distinct ones).

The product of its digits is 15552, while the sum is 33.

The square root of 161423493 is about 12705.2545429047. The cubic root of 161423493 is about 544.4887532344.

The spelling of 161423493 in words is "one hundred sixty-one million, four hundred twenty-three thousand, four hundred ninety-three".