149776421 has 2 divisors, whose sum is σ = 149776422. Its totient is φ = 149776420.

The previous prime is 149776399. The next prime is 149776427. The reversal of 149776421 is 124677941.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97792321 + 51984100 = 9889^2 + 7210^2 .

It is a cyclic number.

It is not a de Polignac number, because 149776421 - 2¹⁰ = 149775397 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (149776427) 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, 74888210 + 74888211.

It is an arithmetic number, because the mean of its divisors is an integer number (74888211).

Almost surely, 2^149776421 is an apocalyptic number.

It is an amenable number.

149776421 is a deficient number, since it is larger than the sum of its proper divisors (1).

149776421 is an equidigital number, since it uses as much as digits as its factorization.

149776421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 41.

The square root of 149776421 is about 12238.3177357021. The cubic root of 149776421 is about 531.0651665003.

The spelling of 149776421 in words is "one hundred forty-nine million, seven hundred seventy-six thousand, four hundred twenty-one".