1312051777 has 2 divisors, whose sum is σ = 1312051778. Its totient is φ = 1312051776.

The previous prime is 1312051691. The next prime is 1312051787. The reversal of 1312051777 is 7771502131.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 987907761 + 324144016 = 31431^2 + 18004^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312051777 - 2¹⁹ = 1311527489 is a prime.

It is not a weakly prime, because it can be changed into another prime (1312051787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656025888 + 656025889.

It is an arithmetic number, because the mean of its divisors is an integer number (656025889).

Almost surely, 2^1312051777 is an apocalyptic number.

It is an amenable number.

1312051777 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312051777 is an equidigital number, since it uses as much as digits as its factorization.

1312051777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10290, while the sum is 34.

The square root of 1312051777 is about 36222.2552721390. The cubic root of 1312051777 is about 1094.7551357842.

The spelling of 1312051777 in words is "one billion, three hundred twelve million, fifty-one thousand, seven hundred seventy-seven".