989898989899031 has 2 divisors, whose sum is σ = 989898989899032. Its totient is φ = 989898989899030.

The previous prime is 989898989898977. The next prime is 989898989899049. The reversal of 989898989899031 is 130998989898989.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-989898989899031 is a prime.

It is a super-2 number, since 2×989898989899031² (a number of 31 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 989898989899031.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989898989899081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494949494949515 + 494949494949516.

It is an arithmetic number, because the mean of its divisors is an integer number (494949494949516).

Almost surely, 2^{989898989899031} is an apocalyptic number.

989898989899031 is a deficient number, since it is larger than the sum of its proper divisors (1).

989898989899031 is an equidigital number, since it uses as much as digits as its factorization.

989898989899031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 470184984576, while the sum is 107.

The spelling of 989898989899031 in words is "nine hundred eighty-nine trillion, eight hundred ninety-eight billion, nine hundred eighty-nine million, eight hundred ninety-nine thousand, thirty-one".