101601391 has 2 divisors, whose sum is σ = 101601392. Its totient is φ = 101601390.

The previous prime is 101601377. The next prime is 101601427. The reversal of 101601391 is 193106101.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 101601391 - 2⁹ = 101600879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101601361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50800695 + 50800696.

It is an arithmetic number, because the mean of its divisors is an integer number (50800696).

Almost surely, 2^101601391 is an apocalyptic number.

101601391 is a deficient number, since it is larger than the sum of its proper divisors (1).

101601391 is an equidigital number, since it uses as much as digits as its factorization.

101601391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 101601391 is about 10079.7515346362. The cubic root of 101601391 is about 466.6234402705.

Adding to 101601391 its reverse (193106101), we get a palindrome (294707492).

The spelling of 101601391 in words is "one hundred one million, six hundred one thousand, three hundred ninety-one".