2538886781 has 2 divisors, whose sum is σ = 2538886782. Its totient is φ = 2538886780.

The previous prime is 2538886771. The next prime is 2538886787. The reversal of 2538886781 is 1876888352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1828930756 + 709956025 = 42766^2 + 26645^2 .

It is a cyclic number.

It is not a de Polignac number, because 2538886781 - 2³⁰ = 1465144957 is a prime.

It is a super-2 number, since 2×2538886781² = 12891892173473083922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2538886787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1269443390 + 1269443391.

It is an arithmetic number, because the mean of its divisors is an integer number (1269443391).

Almost surely, 2^2538886781 is an apocalyptic number.

It is an amenable number.

2538886781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2538886781 is an equidigital number, since it uses as much as digits as its factorization.

2538886781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5160960, while the sum is 56.

The square root of 2538886781 is about 50387.3672759353. The cubic root of 2538886781 is about 1364.2096317623.

The spelling of 2538886781 in words is "two billion, five hundred thirty-eight million, eight hundred eighty-six thousand, seven hundred eighty-one".