215343240461 has 4 divisors (see below), whose sum is σ = 215344428000. Its totient is φ = 215342052924.

The previous prime is 215343240457. The next prime is 215343240487. The reversal of 215343240461 is 164042343512.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 215343240461 - 2² = 215343240457 is a prime.

It is a super-2 number, since 2×215343240461² (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 (215343249461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 258761 + ... + 705438.

It is an arithmetic number, because the mean of its divisors is an integer number (53836107000).

Almost surely, 2^215343240461 is an apocalyptic number.

It is an amenable number.

215343240461 is a deficient number, since it is larger than the sum of its proper divisors (1187539).

215343240461 is an equidigital number, since it uses as much as digits as its factorization.

215343240461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1187538.

The product of its (nonzero) digits is 69120, while the sum is 35.

Adding to 215343240461 its reverse (164042343512), we get a palindrome (379385583973).

The spelling of 215343240461 in words is "two hundred fifteen billion, three hundred forty-three million, two hundred forty thousand, four hundred sixty-one".