91890525898 has 4 divisors (see below), whose sum is σ = 137835788850. Its totient is φ = 45945262948.

The previous prime is 91890525893. The next prime is 91890525907. The reversal of 91890525898 is 89852509819.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 80005819609 + 11884706289 = 282853^2 + 109017^2 .

It is a super-2 number, since 2×91890525898² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91890525893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22972631473 + ... + 22972631476.

Almost surely, 2^91890525898 is an apocalyptic number.

91890525898 is a deficient number, since it is larger than the sum of its proper divisors (45945262952).

91890525898 is a wasteful number, since it uses less digits than its factorization.

91890525898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45945262951.

The product of its (nonzero) digits is 18662400, while the sum is 64.

The spelling of 91890525898 in words is "ninety-one billion, eight hundred ninety million, five hundred twenty-five thousand, eight hundred ninety-eight".