149733781 has 2 divisors, whose sum is σ = 149733782. Its totient is φ = 149733780.

The previous prime is 149733707. The next prime is 149733821. The reversal of 149733781 is 187337941.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99181681 + 50552100 = 9959^2 + 7110^2 .

It is a cyclic number.

It is not a de Polignac number, because 149733781 - 2⁷ = 149733653 is a prime.

It is a super-2 number, since 2×149733781² = 44840410345111922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (149763781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74866890 + 74866891.

It is an arithmetic number, because the mean of its divisors is an integer number (74866891).

Almost surely, 2^149733781 is an apocalyptic number.

It is an amenable number.

149733781 is a deficient number, since it is larger than the sum of its proper divisors (1).

149733781 is an equidigital number, since it uses as much as digits as its factorization.

149733781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127008, while the sum is 43.

The square root of 149733781 is about 12236.5755422013. The cubic root of 149733781 is about 531.0147652249.

The spelling of 149733781 in words is "one hundred forty-nine million, seven hundred thirty-three thousand, seven hundred eighty-one".