161612513 has 4 divisors (see below), whose sum is σ = 168639168. Its totient is φ = 154585860.

The previous prime is 161612497. The next prime is 161612531. The reversal of 161612513 is 315216161.

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, and also an emirpimes, since its reverse is a distinct semiprime: 315216161 = 13 ⋅24247397.

It is a cyclic number.

It is not a de Polignac number, because 161612513 - 2⁴ = 161612497 is a prime.

It is a super-2 number, since 2×161612513² = 52237208716350338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161612593) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3513293 + ... + 3513338.

It is an arithmetic number, because the mean of its divisors is an integer number (42159792).

Almost surely, 2^161612513 is an apocalyptic number.

It is an amenable number.

161612513 is a deficient number, since it is larger than the sum of its proper divisors (7026655).

161612513 is an equidigital number, since it uses as much as digits as its factorization.

161612513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7026654.

The product of its digits is 1080, while the sum is 26.

The square root of 161612513 is about 12712.6910211804. The cubic root of 161612513 is about 544.7011946765.

Adding to 161612513 its reverse (315216161), we get a palindrome (476828674).

The spelling of 161612513 in words is "one hundred sixty-one million, six hundred twelve thousand, five hundred thirteen".