977791 has 2 divisors, whose sum is σ = 977792. Its totient is φ = 977790.

The previous prime is 977761. The next prime is 977803. The reversal of 977791 is 197779.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (197779) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 977791 - 2¹¹ = 975743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (977761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 488895 + 488896.

It is an arithmetic number, because the mean of its divisors is an integer number (488896).

2⁹⁷⁷⁷⁹¹ is an apocalyptic number.

977791 is a deficient number, since it is larger than the sum of its proper divisors (1).

977791 is an equidigital number, since it uses as much as digits as its factorization.

977791 is an evil number, because the sum of its binary digits is even.

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

The square root of 977791 is about 988.8331507388. The cubic root of 977791 is about 99.2541509218.

The spelling of 977791 in words is "nine hundred seventy-seven thousand, seven hundred ninety-one".