198602591 has 4 divisors (see below), whose sum is σ = 216657384. Its totient is φ = 180547800.

The previous prime is 198602581. The next prime is 198602617. The reversal of 198602591 is 195206891.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 198602591 - 2²² = 194408287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198602531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9027380 + ... + 9027401.

It is an arithmetic number, because the mean of its divisors is an integer number (54164346).

Almost surely, 2^198602591 is an apocalyptic number.

198602591 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

198602591 is a deficient number, since it is larger than the sum of its proper divisors (18054793).

198602591 is a wasteful number, since it uses less digits than its factorization.

198602591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18054792.

The product of its (nonzero) digits is 38880, while the sum is 41.

The square root of 198602591 is about 14092.6431516590. The cubic root of 198602591 is about 583.4383468808.

The spelling of 198602591 in words is "one hundred ninety-eight million, six hundred two thousand, five hundred ninety-one".