770660981 has 2 divisors, whose sum is σ = 770660982. Its totient is φ = 770660980.

The previous prime is 770660971. The next prime is 770661013. The reversal of 770660981 is 189066077.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 694796881 + 75864100 = 26359^2 + 8710^2 .

It is an emirp because it is prime and its reverse (189066077) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 770660981 - 2¹⁰ = 770659957 is a prime.

It is a super-2 number, since 2×770660981² = 1187836695271764722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (770660971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 385330490 + 385330491.

It is an arithmetic number, because the mean of its divisors is an integer number (385330491).

Almost surely, 2^770660981 is an apocalyptic number.

It is an amenable number.

770660981 is a deficient number, since it is larger than the sum of its proper divisors (1).

770660981 is an equidigital number, since it uses as much as digits as its factorization.

770660981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 770660981 is about 27760.7813470731. The cubic root of 770660981 is about 916.8278355660.

The spelling of 770660981 in words is "seven hundred seventy million, six hundred sixty thousand, nine hundred eighty-one".