9901898023 has 4 divisors (see below), whose sum is σ = 9902099880. Its totient is φ = 9901696168.

The previous prime is 9901897997. The next prime is 9901898029. The reversal of 9901898023 is 3208981099.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3208981099 = 3413 ⋅940223.

It is a cyclic number.

It is not a de Polignac number, because 9901898023 - 2⁵ = 9901897991 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 (9901898029) 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, 25161 + ... + 142957.

It is an arithmetic number, because the mean of its divisors is an integer number (2475524970).

Almost surely, 2^9901898023 is an apocalyptic number.

9901898023 is a deficient number, since it is larger than the sum of its proper divisors (201857).

9901898023 is a wasteful number, since it uses less digits than its factorization.

9901898023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201856.

The product of its (nonzero) digits is 279936, while the sum is 49.

The square root of 9901898023 is about 99508.2811780005. The cubic root of 9901898023 is about 2147.3663821478.

The spelling of 9901898023 in words is "nine billion, nine hundred one million, eight hundred ninety-eight thousand, twenty-three".