191222138 has 16 divisors (see below), whose sum is σ = 299928960. Its totient is φ = 91263216.

The previous prime is 191222131. The next prime is 191222149. The reversal of 191222138 is 831222191.

It is a super-4 number, since 4×191222138⁴ (a number of 34 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 191222138.

It is not an unprimeable number, because it can be changed into a prime (191222131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19331 + ... + 27497.

It is an arithmetic number, because the mean of its divisors is an integer number (18745560).

Almost surely, 2^191222138 is an apocalyptic number.

191222138 is a deficient number, since it is larger than the sum of its proper divisors (108706822).

191222138 is a wasteful number, since it uses less digits than its factorization.

191222138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8701.

The product of its digits is 1728, while the sum is 29.

The square root of 191222138 is about 13828.3092965120. The cubic root of 191222138 is about 576.1196964627.

The spelling of 191222138 in words is "one hundred ninety-one million, two hundred twenty-two thousand, one hundred thirty-eight".