861995203 has 2 divisors, whose sum is σ = 861995204. Its totient is φ = 861995202.

The previous prime is 861995201. The next prime is 861995213. The reversal of 861995203 is 302599168.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 861995203 - 2¹ = 861995201 is a prime.

It is a super-2 number, since 2×861995203² = 1486071459990022418, which contains 22 as substring.

Together with 861995201, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 861995203.

It is not a weakly prime, because it can be changed into another prime (861995201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430997601 + 430997602.

It is an arithmetic number, because the mean of its divisors is an integer number (430997602).

Almost surely, 2^861995203 is an apocalyptic number.

861995203 is a deficient number, since it is larger than the sum of its proper divisors (1).

861995203 is an equidigital number, since it uses as much as digits as its factorization.

861995203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 861995203 is about 29359.7548184585. The cubic root of 861995203 is about 951.7033900923.

The spelling of 861995203 in words is "eight hundred sixty-one million, nine hundred ninety-five thousand, two hundred three".