161551215 has 48 divisors (see below), whose sum is σ = 327495168. Its totient is φ = 72128448.

The previous prime is 161551211. The next prime is 161551219. The reversal of 161551215 is 512155161.

161551215 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (161551211) and next prime (161551219).

It is not a de Polignac number, because 161551215 - 2² = 161551211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161551211) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7582 + ... + 19508.

It is an arithmetic number, because the mean of its divisors is an integer number (6822816).

Almost surely, 2^161551215 is an apocalyptic number.

161551215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161551215 is an abundant number, since it is smaller than the sum of its proper divisors (165943953).

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

161551215 is a wasteful number, since it uses less digits than its factorization.

161551215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11988 (or 11985 counting only the distinct ones).

The product of its digits is 1500, while the sum is 27.

The square root of 161551215 is about 12710.2798946365. The cubic root of 161551215 is about 544.6323194071.

The spelling of 161551215 in words is "one hundred sixty-one million, five hundred fifty-one thousand, two hundred fifteen".