191097612 has 36 divisors (see below), whose sum is σ = 511468776. Its totient is φ = 59952000.

The previous prime is 191097589. The next prime is 191097619. The reversal of 191097612 is 216790191.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (191097619) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 155514 + ... + 156737.

It is an arithmetic number, because the mean of its divisors is an integer number (14207466).

Almost surely, 2^191097612 is an apocalyptic number.

191097612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

191097612 is an abundant number, since it is smaller than the sum of its proper divisors (320371164).

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

191097612 is a wasteful number, since it uses less digits than its factorization.

191097612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312278 (or 312273 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 36.

The square root of 191097612 is about 13823.8059882219. The cubic root of 191097612 is about 575.9946107713.

The spelling of 191097612 in words is "one hundred ninety-one million, ninety-seven thousand, six hundred twelve".