2506000781 has 2 divisors, whose sum is σ = 2506000782. Its totient is φ = 2506000780.

The previous prime is 2506000769. The next prime is 2506000843. The reversal of 2506000781 is 1870006052.

2506000781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1484175625 + 1021825156 = 38525^2 + 31966^2 .

It is a cyclic number.

It is not a de Polignac number, because 2506000781 - 2³⁰ = 1432258957 is a prime.

It is a super-2 number, since 2×2506000781² = 12560079828745219922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2506000381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1253000390 + 1253000391.

It is an arithmetic number, because the mean of its divisors is an integer number (1253000391).

Almost surely, 2^2506000781 is an apocalyptic number.

2506000781 is the 22388-th centered decagonal number.

It is an amenable number.

2506000781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2506000781 is an equidigital number, since it uses as much as digits as its factorization.

2506000781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 2506000781 is about 50059.9718437795. The cubic root of 2506000781 is about 1358.2938489917.

The spelling of 2506000781 in words is "two billion, five hundred six million, seven hundred eighty-one", and thus it is an aban number.