181413961 has 3 divisors (see below), whose sum is σ = 181427431. Its totient is φ = 181400492.

The previous prime is 181413943. The next prime is 181414007. The reversal of 181413961 is 169314181.

The square root of 181413961 is 13469.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 169314181 = 103 ⋅1643827.

It can be written as a sum of positive squares in only one way, i.e., 115154361 + 66259600 = 10731^2 + 8140^2 .

It is a de Polignac number, because none of the positive numbers 2^k-181413961 is a prime.

It is a super-2 number, since 2×181413961² = 65822050491419042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (181413931) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 6735 + ... + 20203.

Almost surely, 2^181413961 is an apocalyptic number.

181413961 is the 13469-th square number.

181413961 is the 6735-th centered octagonal number.

It is an amenable number.

181413961 is a deficient number, since it is larger than the sum of its proper divisors (13470).

181413961 is an frugal number, since it uses more digits than its factorization.

181413961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26938 (or 13469 counting only the distinct ones).

The product of its digits is 5184, while the sum is 34.

The cubic root of 181413961 is about 566.0961943244.

Multiplying 181413961 by its product of digits (5184), we get a square (940449973824 = 969768²).

The spelling of 181413961 in words is "one hundred eighty-one million, four hundred thirteen thousand, nine hundred sixty-one".