100442431 has 4 divisors (see below), whose sum is σ = 102579552. Its totient is φ = 98305312.

The previous prime is 100442413. The next prime is 100442437. The reversal of 100442431 is 134244001.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 100442431 - 2¹¹ = 100440383 is a prime.

It is a super-2 number, since 2×100442431² = 20177363890379522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100442399 and 100442408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100442437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1068490 + ... + 1068583.

It is an arithmetic number, because the mean of its divisors is an integer number (25644888).

Almost surely, 2^100442431 is an apocalyptic number.

100442431 is a deficient number, since it is larger than the sum of its proper divisors (2137121).

100442431 is an equidigital number, since it uses as much as digits as its factorization.

100442431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2137120.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 100442431 is about 10022.0971358294. The cubic root of 100442431 is about 464.8424039110.

Adding to 100442431 its reverse (134244001), we get a palindrome (234686432).

The spelling of 100442431 in words is "one hundred million, four hundred forty-two thousand, four hundred thirty-one".