191213092 has 36 divisors (see below), whose sum is σ = 392151564. Its totient is φ = 81338880.

The previous prime is 191213089. The next prime is 191213107. The reversal of 191213092 is 290312191.

191213092 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 45914176 + 145298916 = 6776^2 + 12054^2 .

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 191213092.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23292 + ... + 30412.

It is an arithmetic number, because the mean of its divisors is an integer number (10893099).

Almost surely, 2^191213092 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 191213092, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196075782).

191213092 is an abundant number, since it is smaller than the sum of its proper divisors (200938472).

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

191213092 is a wasteful number, since it uses less digits than its factorization.

191213092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7276 (or 7267 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 191213092 is about 13827.9822099972. The cubic root of 191213092 is about 576.1106116342.

Subtracting 191213092 from its reverse (290312191), we obtain a palindrome (99099099).

The spelling of 191213092 in words is "one hundred ninety-one million, two hundred thirteen thousand, ninety-two".