161139525 has 12 divisors (see below), whose sum is σ = 266417472. Its totient is φ = 85941040.

The previous prime is 161139523. The next prime is 161139527. The reversal of 161139525 is 525931161.

161139525 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (161139523) and next prime (161139527).

It is not a de Polignac number, because 161139525 - 2¹ = 161139523 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161139523) 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, 1074189 + ... + 1074338.

It is an arithmetic number, because the mean of its divisors is an integer number (22201456).

Almost surely, 2^161139525 is an apocalyptic number.

161139525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161139525 is a deficient number, since it is larger than the sum of its proper divisors (105277947).

161139525 is a wasteful number, since it uses less digits than its factorization.

161139525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2148540 (or 2148535 counting only the distinct ones).

The product of its digits is 8100, while the sum is 33.

The square root of 161139525 is about 12694.0744050128. The cubic root of 161139525 is about 544.1692868562.

The spelling of 161139525 in words is "one hundred sixty-one million, one hundred thirty-nine thousand, five hundred twenty-five".