100457581 has 4 divisors (see below), whose sum is σ = 114808672. Its totient is φ = 86106492.

The previous prime is 100457569. The next prime is 100457597. The reversal of 100457581 is 185754001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 100457581 - 2⁹ = 100457069 is a prime.

It is a super-2 number, since 2×100457581² = 20183451160743122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100457531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7175535 + ... + 7175548.

It is an arithmetic number, because the mean of its divisors is an integer number (28702168).

Almost surely, 2^100457581 is an apocalyptic number.

It is an amenable number.

100457581 is a deficient number, since it is larger than the sum of its proper divisors (14351091).

100457581 is an equidigital number, since it uses as much as digits as its factorization.

100457581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14351090.

The product of its (nonzero) digits is 5600, while the sum is 31.

The square root of 100457581 is about 10022.8529371632. The cubic root of 100457581 is about 464.8657738763.

It can be divided in two parts, 1004 and 57581, that added together give a palindrome (58585).

The spelling of 100457581 in words is "one hundred million, four hundred fifty-seven thousand, five hundred eighty-one".