161551120 has 40 divisors (see below), whose sum is σ = 376136640. Its totient is φ = 64529280.

The previous prime is 161551097. The next prime is 161551123. The reversal of 161551120 is 21155161.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 161551091 and 161551100.

It is not an unprimeable number, because it can be changed into a prime (161551123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104755 + ... + 106285.

It is an arithmetic number, because the mean of its divisors is an integer number (9403416).

Almost surely, 2^161551120 is an apocalyptic number.

161551120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161551120 is an abundant number, since it is smaller than the sum of its proper divisors (214585520).

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

161551120 is a wasteful number, since it uses less digits than its factorization.

161551120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2863 (or 2857 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 22.

The square root of 161551120 is about 12710.2761575034. The cubic root of 161551120 is about 544.6322126503.

The spelling of 161551120 in words is "one hundred sixty-one million, five hundred fifty-one thousand, one hundred twenty".