2279491861 has 2 divisors, whose sum is σ = 2279491862. Its totient is φ = 2279491860.

The previous prime is 2279491811. The next prime is 2279491933. The reversal of 2279491861 is 1681949722.

2279491861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2274717636 + 4774225 = 47694^2 + 2185^2 .

It is a cyclic number.

It is not a de Polignac number, because 2279491861 - 2¹³ = 2279483669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2279491811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1139745930 + 1139745931.

It is an arithmetic number, because the mean of its divisors is an integer number (1139745931).

Almost surely, 2^2279491861 is an apocalyptic number.

It is an amenable number.

2279491861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2279491861 is an equidigital number, since it uses as much as digits as its factorization.

2279491861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 49.

The square root of 2279491861 is about 47744.0243486030. The cubic root of 2279491861 is about 1316.0710884831.

The spelling of 2279491861 in words is "two billion, two hundred seventy-nine million, four hundred ninety-one thousand, eight hundred sixty-one".