100431291 has 8 divisors (see below), whose sum is σ = 141785424. Its totient is φ = 63015680.

The previous prime is 100431277. The next prime is 100431293. The reversal of 100431291 is 192134001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 100431291 - 2⁵ = 100431259 is a prime.

It is not an unprimeable number, because it can be changed into a prime (100431293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 984570 + ... + 984671.

It is an arithmetic number, because the mean of its divisors is an integer number (17723178).

Almost surely, 2^100431291 is an apocalyptic number.

100431291 is a deficient number, since it is larger than the sum of its proper divisors (41354133).

100431291 is a wasteful number, since it uses less digits than its factorization.

100431291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1969261.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 100431291 is about 10021.5413485152. The cubic root of 100431291 is about 464.8252181600.

Adding to 100431291 its reverse (192134001), we get a palindrome (292565292).

The spelling of 100431291 in words is "one hundred million, four hundred thirty-one thousand, two hundred ninety-one".