991898000134 has 4 divisors (see below), whose sum is σ = 1487847000204. Its totient is φ = 495949000066.

The previous prime is 991898000131. The next prime is 991898000201. The reversal of 991898000134 is 431000898199.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991898000131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247974500032 + ... + 247974500035.

It is an arithmetic number, because the mean of its divisors is an integer number (371961750051).

Almost surely, 2^991898000134 is an apocalyptic number.

991898000134 is a deficient number, since it is larger than the sum of its proper divisors (495949000070).

991898000134 is a wasteful number, since it uses less digits than its factorization.

991898000134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495949000069.

The product of its (nonzero) digits is 559872, while the sum is 52.

The spelling of 991898000134 in words is "nine hundred ninety-one billion, eight hundred ninety-eight million, one hundred thirty-four", and thus it is an aban number.