776231513 has 2 divisors, whose sum is σ = 776231514. Its totient is φ = 776231512.

The previous prime is 776231503. The next prime is 776231551. The reversal of 776231513 is 315132677.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 436308544 + 339922969 = 20888^2 + 18437^2 .

It is an emirp because it is prime and its reverse (315132677) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 776231513 - 2⁴ = 776231497 is a prime.

It is not a weakly prime, because it can be changed into another prime (776231503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 388115756 + 388115757.

It is an arithmetic number, because the mean of its divisors is an integer number (388115757).

Almost surely, 2^776231513 is an apocalyptic number.

It is an amenable number.

776231513 is a deficient number, since it is larger than the sum of its proper divisors (1).

776231513 is an equidigital number, since it uses as much as digits as its factorization.

776231513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26460, while the sum is 35.

The square root of 776231513 is about 27860.9316606606. The cubic root of 776231513 is about 919.0315553503.

The spelling of 776231513 in words is "seven hundred seventy-six million, two hundred thirty-one thousand, five hundred thirteen".