5997781 has 2 divisors, whose sum is σ = 5997782. Its totient is φ = 5997780.

The previous prime is 5997743. The next prime is 5997791. The reversal of 5997781 is 1877995.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5716881 + 280900 = 2391^2 + 530^2 .

It is a cyclic number.

It is not a de Polignac number, because 5997781 - 2¹³ = 5989589 is a prime.

It is a super-2 number, since 2×5997781² = 71946753847922, which contains 22 as substring.

5997781 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5997721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2998890 + 2998891.

It is an arithmetic number, because the mean of its divisors is an integer number (2998891).

Almost surely, 2^5997781 is an apocalyptic number.

It is an amenable number.

5997781 is a deficient number, since it is larger than the sum of its proper divisors (1).

5997781 is an equidigital number, since it uses as much as digits as its factorization.

5997781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 158760, while the sum is 46.

The square root of 5997781 is about 2449.0367494180. The cubic root of 5997781 is about 181.6896554622.

The spelling of 5997781 in words is "five million, nine hundred ninety-seven thousand, seven hundred eighty-one".