2540123281 has 4 divisors (see below), whose sum is σ = 2673814000. Its totient is φ = 2406432564.

The previous prime is 2540123269. The next prime is 2540123293. The reversal of 2540123281 is 1823210452.

2540123281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (2540123269) and next prime (2540123293).

It is a cyclic number.

It is not a de Polignac number, because 2540123281 - 2⁵ = 2540123249 is a prime.

It is a super-2 number, since 2×2540123281² = 12904452565356409922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2540123231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66845331 + ... + 66845368.

It is an arithmetic number, because the mean of its divisors is an integer number (668453500).

Almost surely, 2^2540123281 is an apocalyptic number.

It is an amenable number.

2540123281 is a deficient number, since it is larger than the sum of its proper divisors (133690719).

2540123281 is a wasteful number, since it uses less digits than its factorization.

2540123281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133690718.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 2540123281 is about 50399.6357228899. The cubic root of 2540123281 is about 1364.4310636449.

The spelling of 2540123281 in words is "two billion, five hundred forty million, one hundred twenty-three thousand, two hundred eighty-one".