161423502 has 16 divisors (see below), whose sum is σ = 327666432. Its totient is φ = 53004600.

The previous prime is 161423491. The next prime is 161423527. The reversal of 161423502 is 205324161.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 200374 + ... + 201177.

It is an arithmetic number, because the mean of its divisors is an integer number (20479152).

Almost surely, 2^161423502 is an apocalyptic number.

161423502 is an abundant number, since it is smaller than the sum of its proper divisors (166242930).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161423502 is a wasteful number, since it uses less digits than its factorization.

161423502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401623.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 161423502 is about 12705.2548970888. The cubic root of 161423502 is about 544.4887633535.

Adding to 161423502 its reverse (205324161), we get a palindrome (366747663).

The spelling of 161423502 in words is "one hundred sixty-one million, four hundred twenty-three thousand, five hundred two".