2781901 has 2 divisors, whose sum is σ = 2781902. Its totient is φ = 2781900.

The previous prime is 2781887. The next prime is 2781913. The reversal of 2781901 is 1091872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1729225 + 1052676 = 1315^2 + 1026^2 .

It is a cyclic number.

It is not a de Polignac number, because 2781901 - 2¹⁵ = 2749133 is a prime.

It is a Chen prime.

2781901 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2781901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2781991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1390950 + 1390951.

It is an arithmetic number, because the mean of its divisors is an integer number (1390951).

2^2781901 is an apocalyptic number.

It is an amenable number.

2781901 is a deficient number, since it is larger than the sum of its proper divisors (1).

2781901 is an equidigital number, since it uses as much as digits as its factorization.

2781901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 2781901 is about 1667.9031746477. The cubic root of 2781901 is about 140.6416297041.

The spelling of 2781901 in words is "two million, seven hundred eighty-one thousand, nine hundred one".