100401391 has 2 divisors, whose sum is σ = 100401392. Its totient is φ = 100401390.

The previous prime is 100401383. The next prime is 100401401. The reversal of 100401391 is 193104001.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (193104001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 100401391 - 2³ = 100401383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100401311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50200695 + 50200696.

It is an arithmetic number, because the mean of its divisors is an integer number (50200696).

Almost surely, 2^100401391 is an apocalyptic number.

100401391 is a deficient number, since it is larger than the sum of its proper divisors (1).

100401391 is an equidigital number, since it uses as much as digits as its factorization.

100401391 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 100401391 is about 10020.0494509758. The cubic root of 100401391 is about 464.7790849500.

Adding to 100401391 its reverse (193104001), we get a palindrome (293505392).

The spelling of 100401391 in words is "one hundred million, four hundred one thousand, three hundred ninety-one".