158821111 has 2 divisors, whose sum is σ = 158821112. Its totient is φ = 158821110.

The previous prime is 158821109. The next prime is 158821127. The reversal of 158821111 is 111128851.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 158821111 - 2¹ = 158821109 is a prime.

Together with 158821109, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 158821111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158821181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79410555 + 79410556.

It is an arithmetic number, because the mean of its divisors is an integer number (79410556).

Almost surely, 2^158821111 is an apocalyptic number.

158821111 is a deficient number, since it is larger than the sum of its proper divisors (1).

158821111 is an equidigital number, since it uses as much as digits as its factorization.

158821111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 640, while the sum is 28.

The square root of 158821111 is about 12602.4248063617. The cubic root of 158821111 is about 541.5469030473.

Adding to 158821111 its reverse (111128851), we get a palindrome (269949962).

The spelling of 158821111 in words is "one hundred fifty-eight million, eight hundred twenty-one thousand, one hundred eleven".