22049991 has 6 divisors (see below), whose sum is σ = 31850000. Its totient is φ = 14699988.

The previous prime is 22049983. The next prime is 22049999. The reversal of 22049991 is 19994022.

It is an interprime number because it is at equal distance from previous prime (22049983) and next prime (22049999).

It is not a de Polignac number, because 22049991 - 2³ = 22049983 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 (22049999) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1224991 + ... + 1225008.

Almost surely, 2^22049991 is an apocalyptic number.

22049991 is a deficient number, since it is larger than the sum of its proper divisors (9800009).

22049991 is a wasteful number, since it uses less digits than its factorization.

22049991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2450005 (or 2450002 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 22049991 is about 4695.7417944346. The cubic root of 22049991 is about 280.4160100084.

The spelling of 22049991 in words is "twenty-two million, forty-nine thousand, nine hundred ninety-one".