22511987 has 2 divisors, whose sum is σ = 22511988. Its totient is φ = 22511986.

The previous prime is 22511969. The next prime is 22511999. The reversal of 22511987 is 78911522.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22511987 - 2¹⁰ = 22510963 is a prime.

It is not a weakly prime, because it can be changed into another prime (22511887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11255993 + 11255994.

It is an arithmetic number, because the mean of its divisors is an integer number (11255994).

Almost surely, 2^22511987 is an apocalyptic number.

22511987 is a deficient number, since it is larger than the sum of its proper divisors (1).

22511987 is an equidigital number, since it uses as much as digits as its factorization.

22511987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 35.

The square root of 22511987 is about 4744.6798627515. The cubic root of 22511987 is about 282.3609339811.

The spelling of 22511987 in words is "twenty-two million, five hundred eleven thousand, nine hundred eighty-seven".