161513 has 4 divisors (see below), whose sum is σ = 176208. Its totient is φ = 146820.

The previous prime is 161507. The next prime is 161521. The reversal of 161513 is 315161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161513 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 161491 and 161500.

It is not an unprimeable number, because it can be changed into a prime (161503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7331 + ... + 7352.

It is an arithmetic number, because the mean of its divisors is an integer number (44052).

2¹⁶¹⁵¹³ is an apocalyptic number.

It is an amenable number.

161513 is a deficient number, since it is larger than the sum of its proper divisors (14695).

161513 is a wasteful number, since it uses less digits than its factorization.

161513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14694.

The product of its digits is 90, while the sum is 17.

The square root of 161513 is about 401.8867999823. The cubic root of 161513 is about 54.4589371695.

Adding to 161513 its reverse (315161), we get a palindrome (476674).

The spelling of 161513 in words is "one hundred sixty-one thousand, five hundred thirteen".