91387929898 has 8 divisors (see below), whose sum is σ = 137117155140. Its totient is φ = 45682211520.

The previous prime is 91387929869. The next prime is 91387929907. The reversal of 91387929898 is 89892978319.

It can be written as a sum of positive squares in 2 ways, for example, as 91316982969 + 70946929 = 302187^2 + 8423^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 91387929898.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5866993 + ... + 5882548.

Almost surely, 2^91387929898 is an apocalyptic number.

91387929898 is a deficient number, since it is larger than the sum of its proper divisors (45729225242).

91387929898 is a wasteful number, since it uses less digits than its factorization.

91387929898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11753432.

The product of its digits is 141087744, while the sum is 73.

The spelling of 91387929898 in words is "ninety-one billion, three hundred eighty-seven million, nine hundred twenty-nine thousand, eight hundred ninety-eight".