2190851869 has 2 divisors, whose sum is σ = 2190851870. Its totient is φ = 2190851868.

The previous prime is 2190851833. The next prime is 2190851879. The reversal of 2190851869 is 9681580912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2156394969 + 34456900 = 46437^2 + 5870^2 .

It is a cyclic number.

It is not a de Polignac number, because 2190851869 - 2⁹ = 2190851357 is a prime.

It is a super-2 number, since 2×2190851869² = 9599663823801586322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2190851879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1095425934 + 1095425935.

It is an arithmetic number, because the mean of its divisors is an integer number (1095425935).

Almost surely, 2^2190851869 is an apocalyptic number.

It is an amenable number.

2190851869 is a deficient number, since it is larger than the sum of its proper divisors (1).

2190851869 is an equidigital number, since it uses as much as digits as its factorization.

2190851869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 311040, while the sum is 49.

The square root of 2190851869 is about 46806.5366054785. The cubic root of 2190851869 is about 1298.7862179581.

The spelling of 2190851869 in words is "two billion, one hundred ninety million, eight hundred fifty-one thousand, eight hundred sixty-nine".