771397849 has 2 divisors, whose sum is σ = 771397850. Its totient is φ = 771397848.

The previous prime is 771397807. The next prime is 771397859. The reversal of 771397849 is 948793177.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 670033225 + 101364624 = 25885^2 + 10068^2 .

It is a cyclic number.

It is not a de Polignac number, because 771397849 - 2¹³ = 771389657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 771397849.

It is not a weakly prime, because it can be changed into another prime (771397859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 385698924 + 385698925.

It is an arithmetic number, because the mean of its divisors is an integer number (385698925).

Almost surely, 2^771397849 is an apocalyptic number.

It is an amenable number.

771397849 is a deficient number, since it is larger than the sum of its proper divisors (1).

771397849 is an equidigital number, since it uses as much as digits as its factorization.

771397849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2667168, while the sum is 55.

The square root of 771397849 is about 27774.0499207444. The cubic root of 771397849 is about 917.1199509948.

The spelling of 771397849 in words is "seven hundred seventy-one million, three hundred ninety-seven thousand, eight hundred forty-nine".