22222987 has 2 divisors, whose sum is σ = 22222988. Its totient is φ = 22222986.

The previous prime is 22222973. The next prime is 22222997. The reversal of 22222987 is 78922222.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22222987 is a prime.

It is a super-2 number, since 2×22222987² = 987722302404338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (22222957) 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, 11111493 + 11111494.

It is an arithmetic number, because the mean of its divisors is an integer number (11111494).

Almost surely, 2^22222987 is an apocalyptic number.

22222987 is a deficient number, since it is larger than the sum of its proper divisors (1).

22222987 is an equidigital number, since it uses as much as digits as its factorization.

22222987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 34.

The square root of 22222987 is about 4714.1263241453. The cubic root of 22222987 is about 281.1474469230.

The spelling of 22222987 in words is "twenty-two million, two hundred twenty-two thousand, nine hundred eighty-seven".