98561857 has 2 divisors, whose sum is σ = 98561858. Its totient is φ = 98561856.

The previous prime is 98561849. The next prime is 98561917. The reversal of 98561857 is 75816589.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77986561 + 20575296 = 8831^2 + 4536^2 .

It is a cyclic number.

It is not a de Polignac number, because 98561857 - 2³ = 98561849 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 98561857.

It is not a weakly prime, because it can be changed into another prime (98564857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49280928 + 49280929.

It is an arithmetic number, because the mean of its divisors is an integer number (49280929).

Almost surely, 2^98561857 is an apocalyptic number.

It is an amenable number.

98561857 is a deficient number, since it is larger than the sum of its proper divisors (1).

98561857 is an equidigital number, since it uses as much as digits as its factorization.

98561857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 604800, while the sum is 49.

The square root of 98561857 is about 9927.8324421799. The cubic root of 98561857 is about 461.9230411593.

The spelling of 98561857 in words is "ninety-eight million, five hundred sixty-one thousand, eight hundred fifty-seven".