401400491 has 2 divisors, whose sum is σ = 401400492. Its totient is φ = 401400490.

The previous prime is 401400473. The next prime is 401400499. The reversal of 401400491 is 194004104.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-401400491 is a prime.

It is a super-2 number, since 2×401400491² = 322244708350082162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (401400499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200700245 + 200700246.

It is an arithmetic number, because the mean of its divisors is an integer number (200700246).

Almost surely, 2^401400491 is an apocalyptic number.

401400491 is a deficient number, since it is larger than the sum of its proper divisors (1).

401400491 is an equidigital number, since it uses as much as digits as its factorization.

401400491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 401400491 is about 20034.9816820480. The cubic root of 401400491 is about 737.6652069231.

Adding to 401400491 its reverse (194004104), we get a palindrome (595404595).

The spelling of 401400491 in words is "four hundred one million, four hundred thousand, four hundred ninety-one".