2540435251 has 4 divisors (see below), whose sum is σ = 2558978712. Its totient is φ = 2521891792.

The previous prime is 2540435237. The next prime is 2540435257. The reversal of 2540435251 is 1525340452.

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 2540435251 - 2⁹ = 2540434739 is a prime.

It is a super-2 number, since 2×2540435251² = 12907622529046866002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2540435257) 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, 9271525 + ... + 9271798.

It is an arithmetic number, because the mean of its divisors is an integer number (639744678).

Almost surely, 2^2540435251 is an apocalyptic number.

2540435251 is a deficient number, since it is larger than the sum of its proper divisors (18543461).

2540435251 is a wasteful number, since it uses less digits than its factorization.

2540435251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18543460.

The product of its (nonzero) digits is 24000, while the sum is 31.

The square root of 2540435251 is about 50402.7305907130. The cubic root of 2540435251 is about 1364.4869197441.

The spelling of 2540435251 in words is "two billion, five hundred forty million, four hundred thirty-five thousand, two hundred fifty-one".