156142222 has 4 divisors (see below), whose sum is σ = 234213336. Its totient is φ = 78071110.

The previous prime is 156142219. The next prime is 156142243. The reversal of 156142222 is 222241651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 222241651 = 19 ⋅11696929.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39035554 + ... + 39035557.

It is an arithmetic number, because the mean of its divisors is an integer number (58553334).

Almost surely, 2^156142222 is an apocalyptic number.

156142222 is a deficient number, since it is larger than the sum of its proper divisors (78071114).

156142222 is an equidigital number, since it uses as much as digits as its factorization.

156142222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78071113.

The product of its digits is 1920, while the sum is 25.

The square root of 156142222 is about 12495.6881363133. The cubic root of 156142222 is about 538.4848036698.

Adding to 156142222 its reverse (222241651), we get a palindrome (378383873).

The spelling of 156142222 in words is "one hundred fifty-six million, one hundred forty-two thousand, two hundred twenty-two".