1077721 has 2 divisors, whose sum is σ = 1077722. Its totient is φ = 1077720.

The previous prime is 1077719. The next prime is 1077733. The reversal of 1077721 is 1277701.

1077721 is an esthetic number in base 11, because in such base its adjacent digits differ by 1.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 741321 + 336400 = 861^2 + 580^2 .

It is a cyclic number.

It is not a de Polignac number, because 1077721 - 2¹ = 1077719 is a prime.

It is a super-2 number, since 2×1077721² = 2322965107682, which contains 22 as substring.

Together with 1077719, it forms a pair of twin primes.

1077721 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1077751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 538860 + 538861.

It is an arithmetic number, because the mean of its divisors is an integer number (538861).

2^1077721 is an apocalyptic number.

It is an amenable number.

1077721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1077721 is an equidigital number, since it uses as much as digits as its factorization.

1077721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 686, while the sum is 25.

The square root of 1077721 is about 1038.1334210977. The cubic root of 1077721 is about 102.5263386607.

The spelling of 1077721 in words is "one million, seventy-seven thousand, seven hundred twenty-one".