215111461 has 4 divisors (see below), whose sum is σ = 220358124. Its totient is φ = 209864800.

The previous prime is 215111453. The next prime is 215111467. The reversal of 215111461 is 164111512.

It is a happy number.

215111461 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 34880836 + 180230625 = 5906^2 + 13425^2 .

It is a cyclic number.

It is not a de Polignac number, because 215111461 - 2³ = 215111453 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 (215111467) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2623270 + ... + 2623351.

It is an arithmetic number, because the mean of its divisors is an integer number (55089531).

Almost surely, 2^215111461 is an apocalyptic number.

It is an amenable number.

215111461 is a deficient number, since it is larger than the sum of its proper divisors (5246663).

215111461 is an equidigital number, since it uses as much as digits as its factorization.

215111461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5246662.

The product of its digits is 240, while the sum is 22.

The square root of 215111461 is about 14666.6785946921. The cubic root of 215111461 is about 599.1761480013.

Adding to 215111461 its reverse (164111512), we get a palindrome (379222973).

The spelling of 215111461 in words is "two hundred fifteen million, one hundred eleven thousand, four hundred sixty-one".