149948578181 has 2 divisors, whose sum is σ = 149948578182. Its totient is φ = 149948578180.

The previous prime is 149948578163. The next prime is 149948578187. The reversal of 149948578181 is 181875849941.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142135786081 + 7812792100 = 377009^2 + 88390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-149948578181 is a prime.

It is a super-2 number, since 2×149948578181² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (149948578187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74974289090 + 74974289091.

It is an arithmetic number, because the mean of its divisors is an integer number (74974289091).

Almost surely, 2^149948578181 is an apocalyptic number.

It is an amenable number.

149948578181 is a deficient number, since it is larger than the sum of its proper divisors (1).

149948578181 is an equidigital number, since it uses as much as digits as its factorization.

149948578181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23224320, while the sum is 65.

The spelling of 149948578181 in words is "one hundred forty-nine billion, nine hundred forty-eight million, five hundred seventy-eight thousand, one hundred eighty-one".