771549949 has 2 divisors, whose sum is σ = 771549950. Its totient is φ = 771549948.

The previous prime is 771549943. The next prime is 771549953. The reversal of 771549949 is 949945177.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 735765625 + 35784324 = 27125^2 + 5982^2 .

It is a cyclic number.

It is not a de Polignac number, because 771549949 - 2²⁷ = 637332221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 771549949.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (771549943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 385774974 + 385774975.

It is an arithmetic number, because the mean of its divisors is an integer number (385774975).

Almost surely, 2^771549949 is an apocalyptic number.

It is an amenable number.

771549949 is a deficient number, since it is larger than the sum of its proper divisors (1).

771549949 is an equidigital number, since it uses as much as digits as its factorization.

771549949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2857680, while the sum is 55.

The square root of 771549949 is about 27776.7879532533. The cubic root of 771549949 is about 917.1802245953.

The spelling of 771549949 in words is "seven hundred seventy-one million, five hundred forty-nine thousand, nine hundred forty-nine".