161387520 has 352 divisors, whose sum is σ = 628838400. Its totient is φ = 34504704.

The previous prime is 161387509. The next prime is 161387549. The reversal of 161387520 is 25783161.

It is a super-2 number, since 2×161387520² = 52091863223500800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2042841 + ... + 2042919.

Almost surely, 2^161387520 is an apocalyptic number.

161387520 is a gapful number since it is divisible by the number (10) 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 161387520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (314419200).

161387520 is an abundant number, since it is smaller than the sum of its proper divisors (467450880).

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

161387520 is a wasteful number, since it uses less digits than its factorization.

161387520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133 (or 115 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 161387520 is about 12703.8387899091. The cubic root of 161387520 is about 544.4483040435.

The spelling of 161387520 in words is "one hundred sixty-one million, three hundred eighty-seven thousand, five hundred twenty".