22191542 has 4 divisors (see below), whose sum is σ = 33287316. Its totient is φ = 11095770.

The previous prime is 22191541. The next prime is 22191551. The reversal of 22191542 is 24519122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24519122 = 2 ⋅12259561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22191541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5547884 + ... + 5547887.

It is an arithmetic number, because the mean of its divisors is an integer number (8321829).

Almost surely, 2^22191542 is an apocalyptic number.

22191542 is a deficient number, since it is larger than the sum of its proper divisors (11095774).

22191542 is a wasteful number, since it uses less digits than its factorization.

22191542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11095773.

The product of its digits is 1440, while the sum is 26.

The square root of 22191542 is about 4710.7899549863. The cubic root of 22191542 is about 281.0147786708.

The spelling of 22191542 in words is "twenty-two million, one hundred ninety-one thousand, five hundred forty-two".