161225590 has 8 divisors (see below), whose sum is σ = 290206080. Its totient is φ = 64490232.

The previous prime is 161225579. The next prime is 161225627. The reversal of 161225590 is 95522161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8061270 + ... + 8061289.

It is an arithmetic number, because the mean of its divisors is an integer number (36275760).

Almost surely, 2^161225590 is an apocalyptic number.

161225590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161225590 is a deficient number, since it is larger than the sum of its proper divisors (128980490).

161225590 is a wasteful number, since it uses less digits than its factorization.

161225590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16122566.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 161225590 is about 12697.4639200117. The cubic root of 161225590 is about 544.2661503127.

It can be divided in two parts, 16122 and 5590, that added together give a palindrome (21712).

The spelling of 161225590 in words is "one hundred sixty-one million, two hundred twenty-five thousand, five hundred ninety".