771997 has 2 divisors, whose sum is σ = 771998. Its totient is φ = 771996.

The previous prime is 771973. The next prime is 772001. The reversal of 771997 is 799177.

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., 470596 + 301401 = 686^2 + 549^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-771997 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (771917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 385998 + 385999.

It is an arithmetic number, because the mean of its divisors is an integer number (385999).

2⁷⁷¹⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

771997 is a deficient number, since it is larger than the sum of its proper divisors (1).

771997 is an equidigital number, since it uses as much as digits as its factorization.

771997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27783, while the sum is 40.

The square root of 771997 is about 878.6335982649. The cubic root of 771997 is about 91.7357334395.

The spelling of 771997 in words is "seven hundred seventy-one thousand, nine hundred ninety-seven".