161113525 has 6 divisors (see below), whose sum is σ = 199780802. Its totient is φ = 128890800.

The previous prime is 161113523. The next prime is 161113529. The reversal of 161113525 is 525311161.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 178929 + 160934596 = 423^2 + 12686^2 .

It is not a de Polignac number, because 161113525 - 2¹ = 161113523 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 6444541 = 161113525 / (1 + 6 + 1 + 1 + 1 + 3 + 5 + 2 + 5).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161113525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161113523) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3222246 + ... + 3222295.

Almost surely, 2^161113525 is an apocalyptic number.

It is an amenable number.

161113525 is a deficient number, since it is larger than the sum of its proper divisors (38667277).

161113525 is an equidigital number, since it uses as much as digits as its factorization.

161113525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6444551 (or 6444546 counting only the distinct ones).

The product of its digits is 900, while the sum is 25.

The square root of 161113525 is about 12693.0502638255. The cubic root of 161113525 is about 544.1400178889.

Adding to 161113525 its reverse (525311161), we get a palindrome (686424686).

The spelling of 161113525 in words is "one hundred sixty-one million, one hundred thirteen thousand, five hundred twenty-five".