2497774781 has 2 divisors, whose sum is σ = 2497774782. Its totient is φ = 2497774780.

The previous prime is 2497774777. The next prime is 2497774801. The reversal of 2497774781 is 1874777942.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1704451225 + 793323556 = 41285^2 + 28166^2 .

It is a cyclic number.

It is not a de Polignac number, because 2497774781 - 2² = 2497774777 is a prime.

It is a super-2 number, since 2×2497774781² = 12477757713199195922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2497774711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1248887390 + 1248887391.

It is an arithmetic number, because the mean of its divisors is an integer number (1248887391).

Almost surely, 2^2497774781 is an apocalyptic number.

It is an amenable number.

2497774781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2497774781 is an equidigital number, since it uses as much as digits as its factorization.

2497774781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5531904, while the sum is 56.

The square root of 2497774781 is about 49977.7428561955. The cubic root of 2497774781 is about 1356.8060105217.

The spelling of 2497774781 in words is "two billion, four hundred ninety-seven million, seven hundred seventy-four thousand, seven hundred eighty-one".