161513025 has 12 divisors (see below), whose sum is σ = 267034992. Its totient is φ = 86140240.

The previous prime is 161512993. The next prime is 161513041. The reversal of 161513025 is 520315161.

It is not a de Polignac number, because 161513025 - 2⁵ = 161512993 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 161512986 and 161513004.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1076679 + ... + 1076828.

It is an arithmetic number, because the mean of its divisors is an integer number (22252916).

Almost surely, 2^161513025 is an apocalyptic number.

161513025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161513025 is a deficient number, since it is larger than the sum of its proper divisors (105521967).

161513025 is a wasteful number, since it uses less digits than its factorization.

161513025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2153520 (or 2153515 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 161513025 is about 12708.7774785776. Note that the first 3 decimals coincide. The cubic root of 161513025 is about 544.5893997929.

Adding to 161513025 its reverse (520315161), we get a palindrome (681828186).

The spelling of 161513025 in words is "one hundred sixty-one million, five hundred thirteen thousand, twenty-five".