16161520 has 40 divisors (see below), whose sum is σ = 37765440. Its totient is φ = 6432000.

The previous prime is 16161499. The next prime is 16161521. The reversal of 16161520 is 2516161.

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

It is a super-2 number, since 2×16161520² = 522389457420800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16161491 and 16161500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16161521) 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, 21145 + ... + 21895.

It is an arithmetic number, because the mean of its divisors is an integer number (944136).

Almost surely, 2^16161520 is an apocalyptic number.

16161520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16161520 is an abundant number, since it is smaller than the sum of its proper divisors (21603920).

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

16161520 is a wasteful number, since it uses less digits than its factorization.

16161520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1033 (or 1027 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 16161520 is about 4020.1393010691. The cubic root of 16161520 is about 252.8292994669.

Adding to 16161520 its reverse (2516161), we get a palindrome (18677681).

It can be divided in two parts, 1616 and 1520, that added together give a square (3136 = 56²).

The spelling of 16161520 in words is "sixteen million, one hundred sixty-one thousand, five hundred twenty".