121287863 has 2 divisors, whose sum is σ = 121287864. Its totient is φ = 121287862.

The previous prime is 121287851. The next prime is 121287923. The reversal of 121287863 is 368782121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121287863 - 2⁴ = 121287847 is a prime.

It is a super-2 number, since 2×121287863² = 29421491422213538, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121287833) 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, 60643931 + 60643932.

It is an arithmetic number, because the mean of its divisors is an integer number (60643932).

Almost surely, 2^121287863 is an apocalyptic number.

121287863 is a deficient number, since it is larger than the sum of its proper divisors (1).

121287863 is an equidigital number, since it uses as much as digits as its factorization.

121287863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 38.

The square root of 121287863 is about 11013.0769088389. The cubic root of 121287863 is about 495.0006638769. Note that the first 3 decimals are identical.

It can be divided in two parts, 12128 and 7863, that added together give a palindrome (19991).

The spelling of 121287863 in words is "one hundred twenty-one million, two hundred eighty-seven thousand, eight hundred sixty-three".