161838525 has 24 divisors (see below), whose sum is σ = 268670304. Its totient is φ = 85960000.

The previous prime is 161838517. The next prime is 161838529. The reversal of 161838525 is 525838161.

161838525 = 2990² + 2991² + ... + 3007².

It is not a de Polignac number, because 161838525 - 2³ = 161838517 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161838529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14527 + ... + 23123.

It is an arithmetic number, because the mean of its divisors is an integer number (11194596).

Almost surely, 2^161838525 is an apocalyptic number.

161838525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161838525 is a deficient number, since it is larger than the sum of its proper divisors (106831779).

161838525 is a wasteful number, since it uses less digits than its factorization.

161838525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8861 (or 8856 counting only the distinct ones).

The product of its digits is 57600, while the sum is 39.

The square root of 161838525 is about 12721.5771427917. The cubic root of 161838525 is about 544.9549944600.

The spelling of 161838525 in words is "one hundred sixty-one million, eight hundred thirty-eight thousand, five hundred twenty-five".