22938991 has 4 divisors (see below), whose sum is σ = 23281432. Its totient is φ = 22596552.

The previous prime is 22938943. The next prime is 22939013. The reversal of 22938991 is 19983922.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 22938991 - 2¹¹ = 22936943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22938901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171120 + ... + 171253.

It is an arithmetic number, because the mean of its divisors is an integer number (5820358).

Almost surely, 2^22938991 is an apocalyptic number.

22938991 is a deficient number, since it is larger than the sum of its proper divisors (342441).

22938991 is an equidigital number, since it uses as much as digits as its factorization.

22938991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342440.

The product of its digits is 69984, while the sum is 43.

The square root of 22938991 is about 4789.4666717705. The cubic root of 22938991 is about 284.1350239054.

The spelling of 22938991 in words is "twenty-two million, nine hundred thirty-eight thousand, nine hundred ninety-one".