198987501 has 4 divisors (see below), whose sum is σ = 265316672. Its totient is φ = 132658332.

The previous prime is 198987487. The next prime is 198987539. The reversal of 198987501 is 105789891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 198987501 - 2⁵ = 198987469 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 (198947501) 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, 33164581 + ... + 33164586.

It is an arithmetic number, because the mean of its divisors is an integer number (66329168).

Almost surely, 2^198987501 is an apocalyptic number.

It is an amenable number.

198987501 is a deficient number, since it is larger than the sum of its proper divisors (66329171).

198987501 is an equidigital number, since it uses as much as digits as its factorization.

198987501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66329170.

The product of its (nonzero) digits is 181440, while the sum is 48.

The square root of 198987501 is about 14106.2929574003. The cubic root of 198987501 is about 583.8150226148.

The spelling of 198987501 in words is "one hundred ninety-eight million, nine hundred eighty-seven thousand, five hundred one".