2722581781 has 2 divisors, whose sum is σ = 2722581782. Its totient is φ = 2722581780.

The previous prime is 2722581769. The next prime is 2722581803. The reversal of 2722581781 is 1871852272.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2714931025 + 7650756 = 52105^2 + 2766^2 .

It is a cyclic number.

It is not a de Polignac number, because 2722581781 - 2¹⁵ = 2722549013 is a prime.

It is a super-2 number, since 2×2722581781² = 14824903108466263922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2722581761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1361290890 + 1361290891.

It is an arithmetic number, because the mean of its divisors is an integer number (1361290891).

Almost surely, 2^2722581781 is an apocalyptic number.

It is an amenable number.

2722581781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2722581781 is an equidigital number, since it uses as much as digits as its factorization.

2722581781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 125440, while the sum is 43.

The square root of 2722581781 is about 52178.3650663759. The cubic root of 2722581781 is about 1396.3479271494.

The spelling of 2722581781 in words is "two billion, seven hundred twenty-two million, five hundred eighty-one thousand, seven hundred eighty-one".