215015461 has 4 divisors (see below), whose sum is σ = 215129772. Its totient is φ = 214901152.

The previous prime is 215015447. The next prime is 215015467. The reversal of 215015461 is 164510512.

It is a happy number.

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 199656900 + 15358561 = 14130^2 + 3919^2 .

It is a cyclic number.

It is not a de Polignac number, because 215015461 - 2¹⁵ = 214982693 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 (215015467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54286 + ... + 58111.

It is an arithmetic number, because the mean of its divisors is an integer number (53782443).

Almost surely, 2^215015461 is an apocalyptic number.

It is an amenable number.

215015461 is a deficient number, since it is larger than the sum of its proper divisors (114311).

215015461 is a wasteful number, since it uses less digits than its factorization.

215015461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114310.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 215015461 is about 14663.4055048614. The cubic root of 215015461 is about 599.0870012416.

Adding to 215015461 its reverse (164510512), we get a palindrome (379525973).

It can be divided in two parts, 21501 and 5461, that added together give a palindrome (26962).

The spelling of 215015461 in words is "two hundred fifteen million, fifteen thousand, four hundred sixty-one".