191201988 has 24 divisors (see below), whose sum is σ = 461522880. Its totient is φ = 61536160.

The previous prime is 191201981. The next prime is 191202007. The reversal of 191201988 is 889102191.

It is not an unprimeable number, because it can be changed into a prime (191201981) 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, 274368 + ... + 275063.

It is an arithmetic number, because the mean of its divisors is an integer number (19230120).

Almost surely, 2^191201988 is an apocalyptic number.

It is an amenable number.

191201988 is an abundant number, since it is smaller than the sum of its proper divisors (270320892).

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

191201988 is a wasteful number, since it uses less digits than its factorization.

191201988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549467 (or 549465 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 39.

The square root of 191201988 is about 13827.5806994572. The cubic root of 191201988 is about 576.0994595804.

The spelling of 191201988 in words is "one hundred ninety-one million, two hundred one thousand, nine hundred eighty-eight".