2540000251 has 4 divisors (see below), whose sum is σ = 2540142400. Its totient is φ = 2539858104.

The previous prime is 2540000189. The next prime is 2540000261. The reversal of 2540000251 is 1520000452.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2540000251 - 2²⁹ = 2003129339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2540000261) 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, 39636 + ... + 81553.

It is an arithmetic number, because the mean of its divisors is an integer number (635035600).

Almost surely, 2^2540000251 is an apocalyptic number.

2540000251 is a deficient number, since it is larger than the sum of its proper divisors (142149).

2540000251 is a wasteful number, since it uses less digits than its factorization.

2540000251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142148.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 2540000251 is about 50398.4151635743. The cubic root of 2540000251 is about 1364.4090347057.

The spelling of 2540000251 in words is "two billion, five hundred forty million, two hundred fifty-one", and thus it is an aban number.