2497518781 has 2 divisors, whose sum is σ = 2497518782. Its totient is φ = 2497518780.

The previous prime is 2497518757. The next prime is 2497518787. The reversal of 2497518781 is 1878157942.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1539306756 + 958212025 = 39234^2 + 30955^2 .

It is a cyclic number.

It is not a de Polignac number, because 2497518781 - 2⁹ = 2497518269 is a prime.

It is a super-2 number, since 2×2497518781² = 12475200122895451922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2497518787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1248759390 + 1248759391.

It is an arithmetic number, because the mean of its divisors is an integer number (1248759391).

Almost surely, 2^2497518781 is an apocalyptic number.

It is an amenable number.

2497518781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2497518781 is an equidigital number, since it uses as much as digits as its factorization.

2497518781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1128960, while the sum is 52.

The square root of 2497518781 is about 49975.1816504953. The cubic root of 2497518781 is about 1356.7596553675.

The spelling of 2497518781 in words is "two billion, four hundred ninety-seven million, five hundred eighteen thousand, seven hundred eighty-one".