181149953 has 2 divisors, whose sum is σ = 181149954. Its totient is φ = 181149952.

The previous prime is 181149847. The next prime is 181149959. The reversal of 181149953 is 359941181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96196864 + 84953089 = 9808^2 + 9217^2 .

It is a cyclic number.

It is not a de Polignac number, because 181149953 - 2⁸ = 181149697 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 181149953.

It is not a weakly prime, because it can be changed into another prime (181149959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90574976 + 90574977.

It is an arithmetic number, because the mean of its divisors is an integer number (90574977).

Almost surely, 2^181149953 is an apocalyptic number.

It is an amenable number.

181149953 is a deficient number, since it is larger than the sum of its proper divisors (1).

181149953 is an equidigital number, since it uses as much as digits as its factorization.

181149953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 41.

The square root of 181149953 is about 13459.1958526503. The cubic root of 181149953 is about 565.8214516291.

The spelling of 181149953 in words is "one hundred eighty-one million, one hundred forty-nine thousand, nine hundred fifty-three".