2161520525 has 12 divisors (see below), whose sum is σ = 2682120000. Its totient is φ = 1728032880.

The previous prime is 2161520489. The next prime is 2161520527. The reversal of 2161520525 is 5250251612.

It is not a de Polignac number, because 2161520525 - 2⁸ = 2161520269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161520527) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8636 + ... + 66314.

It is an arithmetic number, because the mean of its divisors is an integer number (223510000).

Almost surely, 2^2161520525 is an apocalyptic number.

2161520525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2161520525 is a deficient number, since it is larger than the sum of its proper divisors (520599475).

2161520525 is a wasteful number, since it uses less digits than its factorization.

2161520525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59188 (or 59183 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 2161520525 is about 46492.1555211199. The cubic root of 2161520525 is about 1292.9640643365.

The spelling of 2161520525 in words is "two billion, one hundred sixty-one million, five hundred twenty thousand, five hundred twenty-five".