98427578621 has 2 divisors, whose sum is σ = 98427578622. Its totient is φ = 98427578620.

The previous prime is 98427578563. The next prime is 98427578653. The reversal of 98427578621 is 12687572489.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59219222500 + 39208356121 = 243350^2 + 198011^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-98427578621 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (98427578021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49213789310 + 49213789311.

It is an arithmetic number, because the mean of its divisors is an integer number (49213789311).

Almost surely, 2^98427578621 is an apocalyptic number.

It is an amenable number.

98427578621 is a deficient number, since it is larger than the sum of its proper divisors (1).

98427578621 is an equidigital number, since it uses as much as digits as its factorization.

98427578621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13547520, while the sum is 59.

The spelling of 98427578621 in words is "ninety-eight billion, four hundred twenty-seven million, five hundred seventy-eight thousand, six hundred twenty-one".