215450405231 has 4 divisors (see below), whose sum is σ = 215481363264. Its totient is φ = 215419447200.

The previous prime is 215450405227. The next prime is 215450405237. The reversal of 215450405231 is 132504054512.

215450405231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 215450405231 - 2² = 215450405227 is a prime.

It is a super-2 number, since 2×215450405231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215450405237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15468575 + ... + 15482496.

It is an arithmetic number, because the mean of its divisors is an integer number (53870340816).

Almost surely, 2^215450405231 is an apocalyptic number.

215450405231 is a deficient number, since it is larger than the sum of its proper divisors (30958033).

215450405231 is an equidigital number, since it uses as much as digits as its factorization.

215450405231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30958032.

The product of its (nonzero) digits is 24000, while the sum is 32.

Adding to 215450405231 its reverse (132504054512), we get a palindrome (347954459743).

The spelling of 215450405231 in words is "two hundred fifteen billion, four hundred fifty million, four hundred five thousand, two hundred thirty-one".