215342461 has 4 divisors (see below), whose sum is σ = 222289024. Its totient is φ = 208395900.

The previous prime is 215342437. The next prime is 215342467. The reversal of 215342461 is 164243512.

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 not a de Polignac number, because 215342461 - 2¹¹ = 215340413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215342467) 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, 3473235 + ... + 3473296.

It is an arithmetic number, because the mean of its divisors is an integer number (55572256).

Almost surely, 2^215342461 is an apocalyptic number.

It is an amenable number.

215342461 is a deficient number, since it is larger than the sum of its proper divisors (6946563).

215342461 is an equidigital number, since it uses as much as digits as its factorization.

215342461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6946562.

The product of its digits is 5760, while the sum is 28.

The square root of 215342461 is about 14674.5514752581. The cubic root of 215342461 is about 599.3905487508.

Adding to 215342461 its reverse (164243512), we get a palindrome (379585973).

The spelling of 215342461 in words is "two hundred fifteen million, three hundred forty-two thousand, four hundred sixty-one".