98921863 has 2 divisors, whose sum is σ = 98921864. Its totient is φ = 98921862.

The previous prime is 98921857. The next prime is 98921909. The reversal of 98921863 is 36812989.

It is an a-pointer prime, because the next prime (98921909) can be obtained adding 98921863 to its sum of digits (46).

It is a weak prime.

It is an emirp because it is prime and its reverse (36812989) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 98921863 - 2¹³ = 98913671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (98921803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49460931 + 49460932.

It is an arithmetic number, because the mean of its divisors is an integer number (49460932).

Almost surely, 2^98921863 is an apocalyptic number.

98921863 is a deficient number, since it is larger than the sum of its proper divisors (1).

98921863 is an equidigital number, since it uses as much as digits as its factorization.

98921863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 46.

The square root of 98921863 is about 9945.9470640055. The cubic root of 98921863 is about 462.4847628776.

The spelling of 98921863 in words is "ninety-eight million, nine hundred twenty-one thousand, eight hundred sixty-three".