100401331 has 4 divisors (see below), whose sum is σ = 100832472. Its totient is φ = 99970192.

The previous prime is 100401311. The next prime is 100401359. The reversal of 100401331 is 133104001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 133104001 = 127 ⋅1048063.

It is a cyclic number.

It is not a de Polignac number, because 100401331 - 2⁵ = 100401299 is a prime.

It is a super-2 number, since 2×100401331² = 20160854533143122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100401311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215221 + ... + 215686.

It is an arithmetic number, because the mean of its divisors is an integer number (25208118).

Almost surely, 2^100401331 is an apocalyptic number.

100401331 is a deficient number, since it is larger than the sum of its proper divisors (431141).

100401331 is an equidigital number, since it uses as much as digits as its factorization.

100401331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431140.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 100401331 is about 10020.0464569781. The cubic root of 100401331 is about 464.7789923658.

Adding to 100401331 its reverse (133104001), we get a palindrome (233505332).

The spelling of 100401331 in words is "one hundred million, four hundred one thousand, three hundred thirty-one".