772991 has 2 divisors, whose sum is σ = 772992. Its totient is φ = 772990.

The previous prime is 772987. The next prime is 773021. The reversal of 772991 is 199277.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 772991 - 2² = 772987 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (772921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 386495 + 386496.

It is an arithmetic number, because the mean of its divisors is an integer number (386496).

2⁷⁷²⁹⁹¹ is an apocalyptic number.

772991 is a deficient number, since it is larger than the sum of its proper divisors (1).

772991 is an equidigital number, since it uses as much as digits as its factorization.

772991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7938, while the sum is 35.

The square root of 772991 is about 879.1990673334. The cubic root of 772991 is about 91.7750886059.

The spelling of 772991 in words is "seven hundred seventy-two thousand, nine hundred ninety-one".