215456461 has 4 divisors (see below), whose sum is σ = 235043424. Its totient is φ = 195869500.

The previous prime is 215456459. The next prime is 215456473. The reversal of 215456461 is 164654512.

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 215456461 - 2¹ = 215456459 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215456401) 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, 9793465 + ... + 9793486.

It is an arithmetic number, because the mean of its divisors is an integer number (58760856).

Almost surely, 2^215456461 is an apocalyptic number.

It is an amenable number.

215456461 is a deficient number, since it is larger than the sum of its proper divisors (19586963).

215456461 is a wasteful number, since it uses less digits than its factorization.

215456461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19586962.

The product of its digits is 28800, while the sum is 34.

The square root of 215456461 is about 14678.4352367683. The cubic root of 215456461 is about 599.4963004110.

The spelling of 215456461 in words is "two hundred fifteen million, four hundred fifty-six thousand, four hundred sixty-one".