401311091 has 2 divisors, whose sum is σ = 401311092. Its totient is φ = 401311090.

The previous prime is 401311069. The next prime is 401311111. The reversal of 401311091 is 190113104.

It is an a-pointer prime, because the next prime (401311111) can be obtained adding 401311091 to its sum of digits (20).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-401311091 is a prime.

It is a super-2 number, since 2×401311091² = 322101183519220562, which contains 22 as substring.

It is equal to p_21402272 and since 401311091 and 21402272 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (401311891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200655545 + 200655546.

It is an arithmetic number, because the mean of its divisors is an integer number (200655546).

Almost surely, 2^401311091 is an apocalyptic number.

401311091 is a deficient number, since it is larger than the sum of its proper divisors (1).

401311091 is an equidigital number, since it uses as much as digits as its factorization.

401311091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 401311091 is about 20032.7504601839. The cubic root of 401311091 is about 737.6104385413.

Adding to 401311091 its reverse (190113104), we get a palindrome (591424195).

It can be divided in two parts, 40 and 1311091, that added together give a palindrome (1311131).

The spelling of 401311091 in words is "four hundred one million, three hundred eleven thousand, ninety-one".