2513781 has 8 divisors (see below), whose sum is σ = 3724160. Its totient is φ = 1675836.

The previous prime is 2513761. The next prime is 2513801. The reversal of 2513781 is 1873152.

It is an interprime number because it is at equal distance from previous prime (2513761) and next prime (2513801).

It is not a de Polignac number, because 2513781 - 2⁷ = 2513653 is a prime.

It is a super-2 number, since 2×2513781² = 12638189831922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 93103 = 2513781 / (2 + 5 + 1 + 3 + 7 + 8 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2513761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46525 + ... + 46578.

It is an arithmetic number, because the mean of its divisors is an integer number (465520).

2^2513781 is an apocalyptic number.

It is an amenable number.

2513781 is a deficient number, since it is larger than the sum of its proper divisors (1210379).

2513781 is an equidigital number, since it uses as much as digits as its factorization.

2513781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93112 (or 93106 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 2513781 is about 1585.4907757537. The cubic root of 2513781 is about 135.9698065902.

The spelling of 2513781 in words is "two million, five hundred thirteen thousand, seven hundred eighty-one".