149721757 has 2 divisors, whose sum is σ = 149721758. Its totient is φ = 149721756.

The previous prime is 149721701. The next prime is 149721769. The reversal of 149721757 is 757127941.

149721757 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87216921 + 62504836 = 9339^2 + 7906^2 .

It is a cyclic number.

It is not a de Polignac number, because 149721757 - 2⁷ = 149721629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (149721797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74860878 + 74860879.

It is an arithmetic number, because the mean of its divisors is an integer number (74860879).

Almost surely, 2^149721757 is an apocalyptic number.

It is an amenable number.

149721757 is a deficient number, since it is larger than the sum of its proper divisors (1).

149721757 is an equidigital number, since it uses as much as digits as its factorization.

149721757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 123480, while the sum is 43.

The square root of 149721757 is about 12236.0842184091. The cubic root of 149721757 is about 531.0005509030. Note that the first 3 decimals are identical.

The spelling of 149721757 in words is "one hundred forty-nine million, seven hundred twenty-one thousand, seven hundred fifty-seven".