100402544581 has 2 divisors, whose sum is σ = 100402544582. Its totient is φ = 100402544580.

The previous prime is 100402544519. The next prime is 100402544597. The reversal of 100402544581 is 185445204001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64239437025 + 36163107556 = 253455^2 + 190166^2 .

It is a cyclic number.

It is not a de Polignac number, because 100402544581 - 2²³ = 100394155973 is a prime.

It is a super-2 number, since 2×100402544581² (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 (100402544381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50201272290 + 50201272291.

It is an arithmetic number, because the mean of its divisors is an integer number (50201272291).

Almost surely, 2^100402544581 is an apocalyptic number.

It is an amenable number.

100402544581 is a deficient number, since it is larger than the sum of its proper divisors (1).

100402544581 is an equidigital number, since it uses as much as digits as its factorization.

100402544581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25600, while the sum is 34.

Adding to 100402544581 its reverse (185445204001), we get a palindrome (285847748582).

The spelling of 100402544581 in words is "one hundred billion, four hundred two million, five hundred forty-four thousand, five hundred eighty-one".