2781251 has 16 divisors (see below), whose sum is σ = 3265920. Its totient is φ = 2340480.

The previous prime is 2781221. The next prime is 2781271. The reversal of 2781251 is 1521872.

2781251 = 345² + 346² + ... + 366².

It is a cyclic number.

It is not a de Polignac number, because 2781251 - 2¹⁸ = 2519107 is a prime.

It is a Duffinian number.

2781251 is a modest number, since divided by 1251 gives 278 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 2781251.

It is not an unprimeable number, because it can be changed into a prime (2781211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19940 + ... + 20078.

It is an arithmetic number, because the mean of its divisors is an integer number (204120).

2^2781251 is an apocalyptic number.

2781251 is a deficient number, since it is larger than the sum of its proper divisors (484669).

2781251 is a wasteful number, since it uses less digits than its factorization.

2781251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274.

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

The square root of 2781251 is about 1667.7083078284. The cubic root of 2781251 is about 140.6306750632.

The spelling of 2781251 in words is "two million, seven hundred eighty-one thousand, two hundred fifty-one".