99881281573 has 2 divisors, whose sum is σ = 99881281574. Its totient is φ = 99881281572.

The previous prime is 99881281541. The next prime is 99881281601. The reversal of 99881281573 is 37518218899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98215172449 + 1666109124 = 313393^2 + 40818^2 .

It is a cyclic number.

It is not a de Polignac number, because 99881281573 - 2⁵ = 99881281541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99881281373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49940640786 + 49940640787.

It is an arithmetic number, because the mean of its divisors is an integer number (49940640787).

Almost surely, 2^99881281573 is an apocalyptic number.

It is an amenable number.

99881281573 is a deficient number, since it is larger than the sum of its proper divisors (1).

99881281573 is an equidigital number, since it uses as much as digits as its factorization.

99881281573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8709120, while the sum is 61.

The spelling of 99881281573 in words is "ninety-nine billion, eight hundred eighty-one million, two hundred eighty-one thousand, five hundred seventy-three".