2191258873 has 2 divisors, whose sum is σ = 2191258874. Its totient is φ = 2191258872.

The previous prime is 2191258831. The next prime is 2191258903. The reversal of 2191258873 is 3788521912.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2022570729 + 168688144 = 44973^2 + 12988^2 .

It is a cyclic number.

It is not a de Polignac number, because 2191258873 - 2¹³ = 2191250681 is a prime.

It is not a weakly prime, because it can be changed into another prime (2111258873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1095629436 + 1095629437.

It is an arithmetic number, because the mean of its divisors is an integer number (1095629437).

Almost surely, 2^2191258873 is an apocalyptic number.

It is an amenable number.

2191258873 is a deficient number, since it is larger than the sum of its proper divisors (1).

2191258873 is an equidigital number, since it uses as much as digits as its factorization.

2191258873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 46.

The square root of 2191258873 is about 46810.8841296551. The cubic root of 2191258873 is about 1298.8666400171.

The spelling of 2191258873 in words is "two billion, one hundred ninety-one million, two hundred fifty-eight thousand, eight hundred seventy-three".