401326391 has 2 divisors, whose sum is σ = 401326392. Its totient is φ = 401326390.

The previous prime is 401326363. The next prime is 401326397. The reversal of 401326391 is 193623104.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-401326391 is a prime.

It is a super-2 number, since 2×401326391² = 322125744226169762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401326397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200663195 + 200663196.

It is an arithmetic number, because the mean of its divisors is an integer number (200663196).

Almost surely, 2^401326391 is an apocalyptic number.

401326391 is a deficient number, since it is larger than the sum of its proper divisors (1).

401326391 is an equidigital number, since it uses as much as digits as its factorization.

401326391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 401326391 is about 20033.1323312157. The cubic root of 401326391 is about 737.6198122305.

Adding to 401326391 its reverse (193623104), we get a palindrome (594949495).

The spelling of 401326391 in words is "four hundred one million, three hundred twenty-six thousand, three hundred ninety-one".