401215231 has 2 divisors, whose sum is σ = 401215232. Its totient is φ = 401215230.

The previous prime is 401215189. The next prime is 401215291. The reversal of 401215231 is 132512104.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 401215231 - 2⁷ = 401215103 is a prime.

It is a super-2 number, since 2×401215231² = 321947323172766722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 401215199 and 401215208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401215291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200607615 + 200607616.

It is an arithmetic number, because the mean of its divisors is an integer number (200607616).

Almost surely, 2^401215231 is an apocalyptic number.

401215231 is a deficient number, since it is larger than the sum of its proper divisors (1).

401215231 is an equidigital number, since it uses as much as digits as its factorization.

401215231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 401215231 is about 20030.3577351978. The cubic root of 401215231 is about 737.5517035857.

Adding to 401215231 its reverse (132512104), we get a palindrome (533727335).

The spelling of 401215231 in words is "four hundred one million, two hundred fifteen thousand, two hundred thirty-one".