215481461 has 4 divisors (see below), whose sum is σ = 232056972. Its totient is φ = 198905952.

The previous prime is 215481449. The next prime is 215481479. The reversal of 215481461 is 164184512.

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

It can be written as a sum of positive squares in 2 ways, for example, as 48580900 + 166900561 = 6970^2 + 12919^2 .

It is a cyclic number.

It is not a de Polignac number, because 215481461 - 2¹⁴ = 215465077 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 (215481491) 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, 8287736 + ... + 8287761.

It is an arithmetic number, because the mean of its divisors is an integer number (58014243).

Almost surely, 2^215481461 is an apocalyptic number.

It is an amenable number.

215481461 is a deficient number, since it is larger than the sum of its proper divisors (16575511).

215481461 is a wasteful number, since it uses less digits than its factorization.

215481461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16575510.

The product of its digits is 7680, while the sum is 32.

The square root of 215481461 is about 14679.2868014764. The cubic root of 215481461 is about 599.5194865771.

The spelling of 215481461 in words is "two hundred fifteen million, four hundred eighty-one thousand, four hundred sixty-one".