1211863 has 2 divisors, whose sum is σ = 1211864. Its totient is φ = 1211862.

The previous prime is 1211857. The next prime is 1211897. The reversal of 1211863 is 3681121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1211863 - 2¹⁷ = 1080791 is a prime.

It is a super-2 number, since 2×1211863² = 2937223861538, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605931 + 605932.

It is an arithmetic number, because the mean of its divisors is an integer number (605932).

2^1211863 is an apocalyptic number.

1211863 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211863 is an equidigital number, since it uses as much as digits as its factorization.

1211863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 22.

The square root of 1211863 is about 1100.8464924775. The cubic root of 1211863 is about 106.6148848055.

Adding to 1211863 its reverse (3681121), we get a palindrome (4892984).

The spelling of 1211863 in words is "one million, two hundred eleven thousand, eight hundred sixty-three".