101022391 has 2 divisors, whose sum is σ = 101022392. Its totient is φ = 101022390.

The previous prime is 101022379. The next prime is 101022413. The reversal of 101022391 is 193220101.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 101022391 - 2⁵ = 101022359 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101022301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50511195 + 50511196.

It is an arithmetic number, because the mean of its divisors is an integer number (50511196).

Almost surely, 2^101022391 is an apocalyptic number.

101022391 is a deficient number, since it is larger than the sum of its proper divisors (1).

101022391 is an equidigital number, since it uses as much as digits as its factorization.

101022391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 101022391 is about 10050.9895532729. The cubic root of 101022391 is about 465.7353624620.

Adding to 101022391 its reverse (193220101), we get a palindrome (294242492).

The spelling of 101022391 in words is "one hundred one million, twenty-two thousand, three hundred ninety-one".