149526721 has 2 divisors, whose sum is σ = 149526722. Its totient is φ = 149526720.

The previous prime is 149526701. The next prime is 149526739. The reversal of 149526721 is 127625941.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133726096 + 15800625 = 11564^2 + 3975^2 .

It is a cyclic number.

It is not a de Polignac number, because 149526721 - 2⁷ = 149526593 is a prime.

It is not a weakly prime, because it can be changed into another prime (149526701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74763360 + 74763361.

It is an arithmetic number, because the mean of its divisors is an integer number (74763361).

Almost surely, 2^149526721 is an apocalyptic number.

It is an amenable number.

149526721 is a deficient number, since it is larger than the sum of its proper divisors (1).

149526721 is an equidigital number, since it uses as much as digits as its factorization.

149526721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 37.

The square root of 149526721 is about 12228.1119147643. Note that the first 3 decimals coincide. The cubic root of 149526721 is about 530.7698802964.

The spelling of 149526721 in words is "one hundred forty-nine million, five hundred twenty-six thousand, seven hundred twenty-one".