2001777389 has 2 divisors, whose sum is σ = 2001777390. Its totient is φ = 2001777388.

The previous prime is 2001777383. The next prime is 2001777391. The reversal of 2001777389 is 9837771002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1985415364 + 16362025 = 44558^2 + 4045^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001777389 - 2⁴ = 2001777373 is a prime.

It is a super-2 number, since 2×2001777389² = 8014225430223314642, which contains 22 as substring.

Together with 2001777391, 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 (2001777383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000888694 + 1000888695.

It is an arithmetic number, because the mean of its divisors is an integer number (1000888695).

Almost surely, 2^2001777389 is an apocalyptic number.

It is an amenable number.

2001777389 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001777389 is an equidigital number, since it uses as much as digits as its factorization.

2001777389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 148176, while the sum is 44.

The square root of 2001777389 is about 44741.2269500960. The cubic root of 2001777389 is about 1260.2941676899.

The spelling of 2001777389 in words is "two billion, one million, seven hundred seventy-seven thousand, three hundred eighty-nine".