772661 has 2 divisors, whose sum is σ = 772662. Its totient is φ = 772660.

The previous prime is 772657. The next prime is 772663. The reversal of 772661 is 166277.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 448900 + 323761 = 670^2 + 569^2 .

It is a cyclic number.

It is not a de Polignac number, because 772661 - 2² = 772657 is a prime.

Together with 772663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (772663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 386330 + 386331.

It is an arithmetic number, because the mean of its divisors is an integer number (386331).

2⁷⁷²⁶⁶¹ is an apocalyptic number.

It is an amenable number.

772661 is a deficient number, since it is larger than the sum of its proper divisors (1).

772661 is an equidigital number, since it uses as much as digits as its factorization.

772661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3528, while the sum is 29.

The square root of 772661 is about 879.0113764907. The cubic root of 772661 is about 91.7620267504.

The spelling of 772661 in words is "seven hundred seventy-two thousand, six hundred sixty-one".