100420531 has 4 divisors (see below), whose sum is σ = 102315312. Its totient is φ = 98525752.

The previous prime is 100420519. The next prime is 100420549. The reversal of 100420531 is 135024001.

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 100420531 - 2⁵ = 100420499 is a prime.

It is a super-2 number, since 2×100420531² = 20168566092643922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100420031) 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, 947311 + ... + 947416.

It is an arithmetic number, because the mean of its divisors is an integer number (25578828).

Almost surely, 2^100420531 is an apocalyptic number.

100420531 is a deficient number, since it is larger than the sum of its proper divisors (1894781).

100420531 is an equidigital number, since it uses as much as digits as its factorization.

100420531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1894780.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 100420531 is about 10021.0044905688. The cubic root of 100420531 is about 464.8086174308.

Adding to 100420531 its reverse (135024001), we get a palindrome (235444532).

The spelling of 100420531 in words is "one hundred million, four hundred twenty thousand, five hundred thirty-one".