191621142 has 48 divisors (see below), whose sum is σ = 435352320. Its totient is φ = 60797616.

The previous prime is 191621141. The next prime is 191621149. The reversal of 191621142 is 241126191.

It is a super-2 number, since 2×191621142² = 73437324122768328, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191621141) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 92959 + ... + 94997.

It is an arithmetic number, because the mean of its divisors is an integer number (9069840).

Almost surely, 2^191621142 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 191621142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (217676160).

191621142 is an abundant number, since it is smaller than the sum of its proper divisors (243731178).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

191621142 is a wasteful number, since it uses less digits than its factorization.

191621142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2297 (or 2294 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 191621142 is about 13842.7288494718. The cubic root of 191621142 is about 576.5201284172.

The spelling of 191621142 in words is "one hundred ninety-one million, six hundred twenty-one thousand, one hundred forty-two".