98807921 has 2 divisors, whose sum is σ = 98807922. Its totient is φ = 98807920.

The previous prime is 98807873. The next prime is 98807939. The reversal of 98807921 is 12970889.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98109025 + 698896 = 9905^2 + 836^2 .

It is an emirp because it is prime and its reverse (12970889) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-98807921 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (98807981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49403960 + 49403961.

It is an arithmetic number, because the mean of its divisors is an integer number (49403961).

Almost surely, 2^98807921 is an apocalyptic number.

It is an amenable number.

98807921 is a deficient number, since it is larger than the sum of its proper divisors (1).

98807921 is an equidigital number, since it uses as much as digits as its factorization.

98807921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 98807921 is about 9940.2173517484. The cubic root of 98807921 is about 462.3071254211.

The spelling of 98807921 in words is "ninety-eight million, eight hundred seven thousand, nine hundred twenty-one".