100231997 has 2 divisors, whose sum is σ = 100231998. Its totient is φ = 100231996.

The previous prime is 100231987. The next prime is 100232009. The reversal of 100231997 is 799132001.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97042201 + 3189796 = 9851^2 + 1786^2 .

It is a cyclic number.

It is not a de Polignac number, because 100231997 - 2⁴ = 100231981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100231987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50115998 + 50115999.

It is an arithmetic number, because the mean of its divisors is an integer number (50115999).

Almost surely, 2^100231997 is an apocalyptic number.

It is an amenable number.

100231997 is a deficient number, since it is larger than the sum of its proper divisors (1).

100231997 is an equidigital number, since it uses as much as digits as its factorization.

100231997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 100231997 is about 10011.5931299669. The cubic root of 100231997 is about 464.5175510329.

Adding to 100231997 its reverse (799132001), we get a palindrome (899363998).

The spelling of 100231997 in words is "one hundred million, two hundred thirty-one thousand, nine hundred ninety-seven".