161212604 has 12 divisors (see below), whose sum is σ = 322425264. Its totient is φ = 69091104.

The previous prime is 161212561. The next prime is 161212607. The reversal of 161212604 is 406212161.

161212604 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 161212604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161212607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2878769 + ... + 2878824.

It is an arithmetic number, because the mean of its divisors is an integer number (26868772).

Almost surely, 2^161212604 is an apocalyptic number.

161212604 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

161212604 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

161212604 is a wasteful number, since it uses less digits than its factorization.

161212604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5757604 (or 5757602 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 161212604 is about 12696.9525477573. The cubic root of 161212604 is about 544.2515371858.

Adding to 161212604 its reverse (406212161), we get a palindrome (567424765).

The spelling of 161212604 in words is "one hundred sixty-one million, two hundred twelve thousand, six hundred four".