100231591 has 2 divisors, whose sum is σ = 100231592. Its totient is φ = 100231590.

The previous prime is 100231583. The next prime is 100231597. The reversal of 100231591 is 195132001.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 100231591 - 2³ = 100231583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100231597) 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 as a sum of consecutive naturals, namely, 50115795 + 50115796.

It is an arithmetic number, because the mean of its divisors is an integer number (50115796).

Almost surely, 2^100231591 is an apocalyptic number.

100231591 is a deficient number, since it is larger than the sum of its proper divisors (1).

100231591 is an equidigital number, since it uses as much as digits as its factorization.

100231591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 270, while the sum is 22.

The square root of 100231591 is about 10011.5728534531. The cubic root of 100231591 is about 464.5169238400.

Adding to 100231591 its reverse (195132001), we get a palindrome (295363592).

The spelling of 100231591 in words is "one hundred million, two hundred thirty-one thousand, five hundred ninety-one".