149923181 has 2 divisors, whose sum is σ = 149923182. Its totient is φ = 149923180.

The previous prime is 149923171. The next prime is 149923201. The reversal of 149923181 is 181329941.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109537156 + 40386025 = 10466^2 + 6355^2 .

It is a cyclic number.

It is not a de Polignac number, because 149923181 - 2¹⁸ = 149661037 is a prime.

It is a super-2 number, since 2×149923181² = 44953920402317522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (149923121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74961590 + 74961591.

It is an arithmetic number, because the mean of its divisors is an integer number (74961591).

Almost surely, 2^149923181 is an apocalyptic number.

It is an amenable number.

149923181 is a deficient number, since it is larger than the sum of its proper divisors (1).

149923181 is an equidigital number, since it uses as much as digits as its factorization.

149923181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 38.

The square root of 149923181 is about 12244.3121897475. The cubic root of 149923181 is about 531.2385664713.

The spelling of 149923181 in words is "one hundred forty-nine million, nine hundred twenty-three thousand, one hundred eighty-one".