215622461 has 2 divisors, whose sum is σ = 215622462. Its totient is φ = 215622460.

The previous prime is 215622443. The next prime is 215622479. The reversal of 215622461 is 164226512.

It is a balanced prime because it is at equal distance from previous prime (215622443) and next prime (215622479).

It can be written as a sum of positive squares in only one way, i.e., 136305625 + 79316836 = 11675^2 + 8906^2 .

It is a cyclic number.

It is not a de Polignac number, because 215622461 - 2¹⁴ = 215606077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215622661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107811230 + 107811231.

It is an arithmetic number, because the mean of its divisors is an integer number (107811231).

Almost surely, 2^215622461 is an apocalyptic number.

It is an amenable number.

215622461 is a deficient number, since it is larger than the sum of its proper divisors (1).

215622461 is an equidigital number, since it uses as much as digits as its factorization.

215622461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 29.

The square root of 215622461 is about 14684.0887017206. The cubic root of 215622461 is about 599.6502229849.

Adding to 215622461 its reverse (164226512), we get a palindrome (379848973).

The spelling of 215622461 in words is "two hundred fifteen million, six hundred twenty-two thousand, four hundred sixty-one".