4999781 has 2 divisors, whose sum is σ = 4999782. Its totient is φ = 4999780.

The previous prime is 4999769. The next prime is 4999783. The reversal of 4999781 is 1879994.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4990756 + 9025 = 2234^2 + 95^2 .

It is a cyclic number.

It is not a de Polignac number, because 4999781 - 2¹⁰ = 4998757 is a prime.

It is a super-2 number, since 2×4999781² = 49995620095922, which contains 22 as substring.

Together with 4999783, 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 (4999783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2499890 + 2499891.

It is an arithmetic number, because the mean of its divisors is an integer number (2499891).

Almost surely, 2^4999781 is an apocalyptic number.

It is an amenable number.

4999781 is a deficient number, since it is larger than the sum of its proper divisors (1).

4999781 is an equidigital number, since it uses as much as digits as its factorization.

4999781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 47.

The square root of 4999781 is about 2236.0190070749. The cubic root of 4999781 is about 170.9950980663.

The spelling of 4999781 in words is "four million, nine hundred ninety-nine thousand, seven hundred eighty-one".