77250149 has 2 divisors, whose sum is σ = 77250150. Its totient is φ = 77250148.

The previous prime is 77250139. The next prime is 77250157. The reversal of 77250149 is 94105277.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49350625 + 27899524 = 7025^2 + 5282^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77250149 is a prime.

It is a Sophie Germain 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 (77250119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38625074 + 38625075.

It is an arithmetic number, because the mean of its divisors is an integer number (38625075).

Almost surely, 2^77250149 is an apocalyptic number.

It is an amenable number.

77250149 is a deficient number, since it is larger than the sum of its proper divisors (1).

77250149 is an equidigital number, since it uses as much as digits as its factorization.

77250149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 77250149 is about 8789.2063919332. The cubic root of 77250149 is about 425.8922872700.

The spelling of 77250149 in words is "seventy-seven million, two hundred fifty thousand, one hundred forty-nine".