2654638781 has 2 divisors, whose sum is σ = 2654638782. Its totient is φ = 2654638780.

The previous prime is 2654638759. The next prime is 2654638787. The reversal of 2654638781 is 1878364562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2573025625 + 81613156 = 50725^2 + 9034^2 .

It is a cyclic number.

It is not a de Polignac number, because 2654638781 - 2²² = 2650444477 is a prime.

It is a super-2 number, since 2×2654638781² = 14094214115178331922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2654638787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1327319390 + 1327319391.

It is an arithmetic number, because the mean of its divisors is an integer number (1327319391).

Almost surely, 2^2654638781 is an apocalyptic number.

It is an amenable number.

2654638781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2654638781 is an equidigital number, since it uses as much as digits as its factorization.

2654638781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1935360, while the sum is 50.

The square root of 2654638781 is about 51523.1868288444. The cubic root of 2654638781 is about 1384.6344886456.

The spelling of 2654638781 in words is "two billion, six hundred fifty-four million, six hundred thirty-eight thousand, seven hundred eighty-one".