149767721 has 2 divisors, whose sum is σ = 149767722. Its totient is φ = 149767720.

The previous prime is 149767703. The next prime is 149767729. The reversal of 149767721 is 127767941.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113635600 + 36132121 = 10660^2 + 6011^2 .

It is a cyclic number.

It is not a de Polignac number, because 149767721 - 2¹⁴ = 149751337 is a prime.

It is not a weakly prime, because it can be changed into another prime (149767729) 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, 74883860 + 74883861.

It is an arithmetic number, because the mean of its divisors is an integer number (74883861).

Almost surely, 2^149767721 is an apocalyptic number.

It is an amenable number.

149767721 is a deficient number, since it is larger than the sum of its proper divisors (1).

149767721 is an equidigital number, since it uses as much as digits as its factorization.

149767721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 148176, while the sum is 44.

The square root of 149767721 is about 12237.9622895317. The cubic root of 149767721 is about 531.0548837148.

The spelling of 149767721 in words is "one hundred forty-nine million, seven hundred sixty-seven thousand, seven hundred twenty-one".