102126391 has 2 divisors, whose sum is σ = 102126392. Its totient is φ = 102126390.

The previous prime is 102126379. The next prime is 102126407. The reversal of 102126391 is 193621201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 102126391 - 2¹¹ = 102124343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102126301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51063195 + 51063196.

It is an arithmetic number, because the mean of its divisors is an integer number (51063196).

Almost surely, 2^102126391 is an apocalyptic number.

102126391 is a deficient number, since it is larger than the sum of its proper divisors (1).

102126391 is an equidigital number, since it uses as much as digits as its factorization.

102126391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 102126391 is about 10105.7602880733. The cubic root of 102126391 is about 467.4257802048.

Adding to 102126391 its reverse (193621201), we get a palindrome (295747592).

The spelling of 102126391 in words is "one hundred two million, one hundred twenty-six thousand, three hundred ninety-one".