161229525 has 12 divisors (see below), whose sum is σ = 266566272. Its totient is φ = 85989040.

The previous prime is 161229521. The next prime is 161229539. The reversal of 161229525 is 525922161.

161229525 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161229525 - 2² = 161229521 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161229521) 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, 1074789 + ... + 1074938.

It is an arithmetic number, because the mean of its divisors is an integer number (22213856).

Almost surely, 2^161229525 is an apocalyptic number.

161229525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161229525 is a deficient number, since it is larger than the sum of its proper divisors (105336747).

161229525 is a wasteful number, since it uses less digits than its factorization.

161229525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2149740 (or 2149735 counting only the distinct ones).

The product of its digits is 10800, while the sum is 33.

The square root of 161229525 is about 12697.6188712687. The cubic root of 161229525 is about 544.2705782075.

The spelling of 161229525 in words is "one hundred sixty-one million, two hundred twenty-nine thousand, five hundred twenty-five".