181145957 has 4 divisors (see below), whose sum is σ = 183849696. Its totient is φ = 178442220.

The previous prime is 181145941. The next prime is 181146001. The reversal of 181145957 is 759541181.

It is a happy number.

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 not a de Polignac number, because 181145957 - 2⁴ = 181145941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181145917) 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, 1351769 + ... + 1351902.

It is an arithmetic number, because the mean of its divisors is an integer number (45962424).

Almost surely, 2^181145957 is an apocalyptic number.

It is an amenable number.

181145957 is a deficient number, since it is larger than the sum of its proper divisors (2703739).

181145957 is an equidigital number, since it uses as much as digits as its factorization.

181145957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2703738.

The product of its digits is 50400, while the sum is 41.

The square root of 181145957 is about 13459.0474031411. The cubic root of 181145957 is about 565.8172910996.

The spelling of 181145957 in words is "one hundred eighty-one million, one hundred forty-five thousand, nine hundred fifty-seven".