22491487 has 4 divisors (see below), whose sum is σ = 22723456. Its totient is φ = 22259520.

The previous prime is 22491481. The next prime is 22491503. The reversal of 22491487 is 78419422.

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 22491487 - 2³ = 22491479 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 (22491481) 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, 115839 + ... + 116032.

It is an arithmetic number, because the mean of its divisors is an integer number (5680864).

Almost surely, 2^22491487 is an apocalyptic number.

22491487 is a deficient number, since it is larger than the sum of its proper divisors (231969).

22491487 is an equidigital number, since it uses as much as digits as its factorization.

22491487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231968.

The product of its digits is 32256, while the sum is 37.

The square root of 22491487 is about 4742.5190563666. The cubic root of 22491487 is about 282.2751995520.

The spelling of 22491487 in words is "twenty-two million, four hundred ninety-one thousand, four hundred eighty-seven".