161613252 has 48 divisors (see below), whose sum is σ = 423344320. Its totient is φ = 53312256.

The previous prime is 161613251. The next prime is 161613281. The reversal of 161613252 is 252316161.

It is a super-2 number, since 2×161613252² = 52237686444031008, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161613251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2763 + ... + 18189.

Almost surely, 2^161613252 is an apocalyptic number.

161613252 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161613252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (211672160).

161613252 is an abundant number, since it is smaller than the sum of its proper divisors (261731068).

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

161613252 is a wasteful number, since it uses less digits than its factorization.

161613252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15537 (or 15529 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 161613252 is about 12712.7200865904. The cubic root of 161613252 is about 544.7020249207.

The spelling of 161613252 in words is "one hundred sixty-one million, six hundred thirteen thousand, two hundred fifty-two".