215231743469 has 4 divisors (see below), whose sum is σ = 220237132896. Its totient is φ = 210226354044.

The previous prime is 215231743421. The next prime is 215231743483. The reversal of 215231743469 is 964347132512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215231743469 is a prime.

It is a super-2 number, since 2×215231743469² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215231743499) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2502694649 + ... + 2502694734.

It is an arithmetic number, because the mean of its divisors is an integer number (55059283224).

Almost surely, 2^215231743469 is an apocalyptic number.

It is an amenable number.

215231743469 is a deficient number, since it is larger than the sum of its proper divisors (5005389427).

215231743469 is an equidigital number, since it uses as much as digits as its factorization.

215231743469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5005389426.

The product of its digits is 1088640, while the sum is 47.

The spelling of 215231743469 in words is "two hundred fifteen billion, two hundred thirty-one million, seven hundred forty-three thousand, four hundred sixty-nine".