215132461 has 2 divisors, whose sum is σ = 215132462. Its totient is φ = 215132460.

The previous prime is 215132441. The next prime is 215132473. The reversal of 215132461 is 164231512.

It is a happy number.

215132461 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194602500 + 20529961 = 13950^2 + 4531^2 .

It is a cyclic number.

It is not a de Polignac number, because 215132461 - 2¹¹ = 215130413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215132441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107566230 + 107566231.

It is an arithmetic number, because the mean of its divisors is an integer number (107566231).

Almost surely, 2^215132461 is an apocalyptic number.

It is an amenable number.

215132461 is a deficient number, since it is larger than the sum of its proper divisors (1).

215132461 is an equidigital number, since it uses as much as digits as its factorization.

215132461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 25.

The square root of 215132461 is about 14667.3944857292. The cubic root of 215132461 is about 599.1956453193.

Adding to 215132461 its reverse (164231512), we get a palindrome (379363973).

The spelling of 215132461 in words is "two hundred fifteen million, one hundred thirty-two thousand, four hundred sixty-one".