2781297 has 10 divisors (see below), whose sum is σ = 4154898. Its totient is φ = 1854144.

The previous prime is 2781293. The next prime is 2781301. The reversal of 2781297 is 7921872.

It is an interprime number because it is at equal distance from previous prime (2781293) and next prime (2781301).

It can be written as a sum of positive squares in only one way, i.e., 2313441 + 467856 = 1521^2 + 684^2 .

It is not a de Polignac number, because 2781297 - 2² = 2781293 is a prime.

It is a super-2 number, since 2×2781297² = 15471226004418, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2781293) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 17088 + ... + 17249.

2^2781297 is an apocalyptic number.

2781297 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

2781297 is a deficient number, since it is larger than the sum of its proper divisors (1373601).

2781297 is an equidigital number, since it uses as much as digits as its factorization.

2781297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34349 (or 34340 counting only the distinct ones).

The product of its digits is 14112, while the sum is 36.

The square root of 2781297 is about 1667.7220991520. The cubic root of 2781297 is about 140.6314503708.

Subtracting from 2781297 its sum of digits (36), we obtain a triangular number (2781261 = T₂₃₅₈).

The spelling of 2781297 in words is "two million, seven hundred eighty-one thousand, two hundred ninety-seven".