22158531891 has 6 divisors (see below), whose sum is σ = 32006768300. Its totient is φ = 14772354588.

The previous prime is 22158531869. The next prime is 22158531893. The reversal of 22158531891 is 19813585122.

22158531891 is a `hidden beast` number, since 2 + 21 + 5 + 8 + 531 + 8 + 91 = 666.

It is not a de Polignac number, because 22158531891 - 2¹⁴ = 22158515507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22158531893) 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, 1231029541 + ... + 1231029558.

Almost surely, 2^22158531891 is an apocalyptic number.

22158531891 is a deficient number, since it is larger than the sum of its proper divisors (9848236409).

22158531891 is a wasteful number, since it uses less digits than its factorization.

22158531891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2462059105 (or 2462059102 counting only the distinct ones).

The product of its digits is 172800, while the sum is 45.

The spelling of 22158531891 in words is "twenty-two billion, one hundred fifty-eight million, five hundred thirty-one thousand, eight hundred ninety-one".