98857921 has 2 divisors, whose sum is σ = 98857922. Its totient is φ = 98857920.

The previous prime is 98857901. The next prime is 98857951. The reversal of 98857921 is 12975889.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95746225 + 3111696 = 9785^2 + 1764^2 .

It is a cyclic number.

It is not a de Polignac number, because 98857921 - 2⁷ = 98857793 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (98857901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49428960 + 49428961.

It is an arithmetic number, because the mean of its divisors is an integer number (49428961).

Almost surely, 2^98857921 is an apocalyptic number.

It is an amenable number.

98857921 is a deficient number, since it is larger than the sum of its proper divisors (1).

98857921 is an equidigital number, since it uses as much as digits as its factorization.

98857921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 49.

The square root of 98857921 is about 9942.7320692051. The cubic root of 98857921 is about 462.3850930513.

The spelling of 98857921 in words is "ninety-eight million, eight hundred fifty-seven thousand, nine hundred twenty-one".