181404953 has 2 divisors, whose sum is σ = 181404954. Its totient is φ = 181404952.

The previous prime is 181404893. The next prime is 181404959. The reversal of 181404953 is 359404181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139310809 + 42094144 = 11803^2 + 6488^2 .

It is an emirp because it is prime and its reverse (359404181) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-181404953 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (181404959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90702476 + 90702477.

It is an arithmetic number, because the mean of its divisors is an integer number (90702477).

Almost surely, 2^181404953 is an apocalyptic number.

It is an amenable number.

181404953 is a deficient number, since it is larger than the sum of its proper divisors (1).

181404953 is an equidigital number, since it uses as much as digits as its factorization.

181404953 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 181404953 is about 13468.6655983434. The cubic root of 181404953 is about 566.0868244484.

The spelling of 181404953 in words is "one hundred eighty-one million, four hundred four thousand, nine hundred fifty-three".