191421498 has 16 divisors (see below), whose sum is σ = 393190560. Its totient is φ = 62082576.

The previous prime is 191421493. The next prime is 191421499. The reversal of 191421498 is 894124191.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (191421493) 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, 430908 + ... + 431351.

It is an arithmetic number, because the mean of its divisors is an integer number (24574410).

Almost surely, 2^191421498 is an apocalyptic number.

191421498 is an abundant number, since it is smaller than the sum of its proper divisors (201769062).

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

191421498 is a wasteful number, since it uses less digits than its factorization.

191421498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862301.

The product of its digits is 20736, while the sum is 39.

The square root of 191421498 is about 13835.5158198023. The cubic root of 191421498 is about 576.3198394876.

The spelling of 191421498 in words is "one hundred ninety-one million, four hundred twenty-one thousand, four hundred ninety-eight".