161223513 has 16 divisors (see below), whose sum is σ = 236088000. Its totient is φ = 97052480.

The previous prime is 161223511. The next prime is 161223523. The reversal of 161223513 is 315322161.

It is a cyclic number.

It is not a de Polignac number, because 161223513 - 2¹ = 161223511 is a prime.

It is a super-2 number, since 2×161223513² = 51986042288122338, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161223511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11478 + ... + 21311.

It is an arithmetic number, because the mean of its divisors is an integer number (14755500).

Almost surely, 2^161223513 is an apocalyptic number.

It is an amenable number.

161223513 is a deficient number, since it is larger than the sum of its proper divisors (74864487).

161223513 is a wasteful number, since it uses less digits than its factorization.

161223513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32952.

The product of its digits is 1080, while the sum is 24.

The square root of 161223513 is about 12697.3821317624. The cubic root of 161223513 is about 544.2638131203.

Adding to 161223513 its reverse (315322161), we get a palindrome (476545674).

The spelling of 161223513 in words is "one hundred sixty-one million, two hundred twenty-three thousand, five hundred thirteen".