775087979 has 2 divisors, whose sum is σ = 775087980. Its totient is φ = 775087978.

The previous prime is 775087969. The next prime is 775087993. The reversal of 775087979 is 979780577.

It is a weak prime.

It is an emirp because it is prime and its reverse (979780577) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-775087979 is a prime.

It is a super-2 number, since 2×775087979² = 1201522750380608882, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (775087969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 387543989 + 387543990.

It is an arithmetic number, because the mean of its divisors is an integer number (387543990).

Almost surely, 2^775087979 is an apocalyptic number.

775087979 is a deficient number, since it is larger than the sum of its proper divisors (1).

775087979 is an equidigital number, since it uses as much as digits as its factorization.

775087979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7779240, while the sum is 59.

The square root of 775087979 is about 27840.4019187942. The cubic root of 775087979 is about 918.5800318402.

The spelling of 775087979 in words is "seven hundred seventy-five million, eighty-seven thousand, nine hundred seventy-nine".