2530781 has 8 divisors (see below), whose sum is σ = 2906400. Its totient is φ = 2179440.

The previous prime is 2530777. The next prime is 2530783. The reversal of 2530781 is 1870352.

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 2530781 - 2² = 2530777 is a prime.

It is a super-2 number, since 2×2530781² = 12809704939922, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 2530781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2530783) 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, 5846 + ... + 6263.

It is an arithmetic number, because the mean of its divisors is an integer number (363300).

2^2530781 is an apocalyptic number.

It is an amenable number.

2530781 is a deficient number, since it is larger than the sum of its proper divisors (375619).

2530781 is a wasteful number, since it uses less digits than its factorization.

2530781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12139.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 2530781 is about 1590.8428583616. The cubic root of 2530781 is about 136.2756268605.

The spelling of 2530781 in words is "two million, five hundred thirty thousand, seven hundred eighty-one".