2539800081 has 48 divisors (see below), whose sum is σ = 4591816320. Its totient is φ = 1316943360.

The previous prime is 2539800073. The next prime is 2539800089. The reversal of 2539800081 is 1800089352.

It is an interprime number because it is at equal distance from previous prime (2539800073) and next prime (2539800089).

It is not a de Polignac number, because 2539800081 - 2³ = 2539800073 is a prime.

It is a super-2 number, since 2×2539800081² = 12901168902895213122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2539800089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 22041 + ... + 74601.

It is an arithmetic number, because the mean of its divisors is an integer number (95662840).

Almost surely, 2^2539800081 is an apocalyptic number.

2539800081 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2539800081 is a deficient number, since it is larger than the sum of its proper divisors (2052016239).

2539800081 is a wasteful number, since it uses less digits than its factorization.

2539800081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52646 (or 52643 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 2539800081 is about 50396.4292485093. The cubic root of 2539800081 is about 1364.3731920674.

The spelling of 2539800081 in words is "two billion, five hundred thirty-nine million, eight hundred thousand, eighty-one".