2512781 has 8 divisors (see below), whose sum is σ = 2607864. Its totient is φ = 2419200.

The previous prime is 2512771. The next prime is 2512789. The reversal of 2512781 is 1872152.

It can be written as a sum of positive squares in 4 ways, for example, as 538756 + 1974025 = 734^2 + 1405^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2512781 - 2¹⁸ = 2250637 is a prime.

It is a super-2 number, since 2×2512781² = 12628136707922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2512781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2512789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3881 + ... + 4481.

It is an arithmetic number, because the mean of its divisors is an integer number (325983).

2^2512781 is an apocalyptic number.

It is an amenable number.

2512781 is a deficient number, since it is larger than the sum of its proper divisors (95083).

2512781 is a wasteful number, since it uses less digits than its factorization.

2512781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751.

The product of its digits is 1120, while the sum is 26.

The square root of 2512781 is about 1585.1753846184. The cubic root of 2512781 is about 135.9517742795.

The spelling of 2512781 in words is "two million, five hundred twelve thousand, seven hundred eighty-one".