161216490 has 16 divisors (see below), whose sum is σ = 386919648. Its totient is φ = 42991056.

The previous prime is 161216483. The next prime is 161216507. The reversal of 161216490 is 94612161.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 5373883 = 161216490 / (1 + 6 + 1 + 2 + 1 + 6 + 4 + 9 + 0).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2686912 + ... + 2686971.

It is an arithmetic number, because the mean of its divisors is an integer number (24182478).

Almost surely, 2^161216490 is an apocalyptic number.

161216490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161216490 is an abundant number, since it is smaller than the sum of its proper divisors (225703158).

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

161216490 is a wasteful number, since it uses less digits than its factorization.

161216490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5373893.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 161216490 is about 12697.1055756814. The cubic root of 161216490 is about 544.2559101782.

The spelling of 161216490 in words is "one hundred sixty-one million, two hundred sixteen thousand, four hundred ninety".