2211490861 has 2 divisors, whose sum is σ = 2211490862. Its totient is φ = 2211490860.

The previous prime is 2211490847. The next prime is 2211490877. The reversal of 2211490861 is 1680941122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1927736836 + 283754025 = 43906^2 + 16845^2 .

It is a cyclic number.

It is not a de Polignac number, because 2211490861 - 2¹⁷ = 2211359789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2211490811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1105745430 + 1105745431.

It is an arithmetic number, because the mean of its divisors is an integer number (1105745431).

Almost surely, 2^2211490861 is an apocalyptic number.

It is an amenable number.

2211490861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2211490861 is an equidigital number, since it uses as much as digits as its factorization.

2211490861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 2211490861 is about 47026.4910555742. The cubic root of 2211490861 is about 1302.8518970158.

The spelling of 2211490861 in words is "two billion, two hundred eleven million, four hundred ninety thousand, eight hundred sixty-one".