22139991 has 12 divisors (see below), whose sum is σ = 32123832. Its totient is φ = 14693616.

The previous prime is 22139981. The next prime is 22139993. The reversal of 22139991 is 19993122.

It is a happy number.

It is not a de Polignac number, because 22139991 - 2⁹ = 22139479 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22139993) 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 in 11 ways as a sum of consecutive naturals, for example, 3376 + ... + 7461.

It is an arithmetic number, because the mean of its divisors is an integer number (2676986).

Almost surely, 2^22139991 is an apocalyptic number.

22139991 is a deficient number, since it is larger than the sum of its proper divisors (9983841).

22139991 is a wasteful number, since it uses less digits than its factorization.

22139991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11070 (or 11067 counting only the distinct ones).

The product of its digits is 8748, while the sum is 36.

The square root of 22139991 is about 4705.3151860423. The cubic root of 22139991 is about 280.7970106458.

The spelling of 22139991 in words is "twenty-two million, one hundred thirty-nine thousand, nine hundred ninety-one".