100203324581 has 2 divisors, whose sum is σ = 100203324582. Its totient is φ = 100203324580.

The previous prime is 100203324569. The next prime is 100203324619. The reversal of 100203324581 is 185423302001.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54816856900 + 45386467681 = 234130^2 + 213041^2 .

It is a cyclic number.

It is not a de Polignac number, because 100203324581 - 2¹⁰ = 100203323557 is a prime.

It is a super-2 number, since 2×100203324581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100203224581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50101662290 + 50101662291.

It is an arithmetic number, because the mean of its divisors is an integer number (50101662291).

Almost surely, 2^100203324581 is an apocalyptic number.

It is an amenable number.

100203324581 is a deficient number, since it is larger than the sum of its proper divisors (1).

100203324581 is an equidigital number, since it uses as much as digits as its factorization.

100203324581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 29.

Adding to 100203324581 its reverse (185423302001), we get a palindrome (285626626582).

The spelling of 100203324581 in words is "one hundred billion, two hundred three million, three hundred twenty-four thousand, five hundred eighty-one".