102111397 has 2 divisors, whose sum is σ = 102111398. Its totient is φ = 102111396.

The previous prime is 102111389. The next prime is 102111431. The reversal of 102111397 is 793111201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71927361 + 30184036 = 8481^2 + 5494^2 .

It is a cyclic number.

It is not a de Polignac number, because 102111397 - 2³ = 102111389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102115397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51055698 + 51055699.

It is an arithmetic number, because the mean of its divisors is an integer number (51055699).

Almost surely, 2^102111397 is an apocalyptic number.

It is an amenable number.

102111397 is a deficient number, since it is larger than the sum of its proper divisors (1).

102111397 is an equidigital number, since it uses as much as digits as its factorization.

102111397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 378, while the sum is 25.

The square root of 102111397 is about 10105.0184067126. The cubic root of 102111397 is about 467.4029035676.

Adding to 102111397 its reverse (793111201), we get a palindrome (895222598).

The spelling of 102111397 in words is "one hundred two million, one hundred eleven thousand, three hundred ninety-seven".