215561413 has 2 divisors, whose sum is σ = 215561414. Its totient is φ = 215561412.

The previous prime is 215561393. The next prime is 215561419. The reversal of 215561413 is 314165512.

215561413 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., 215561124 + 289 = 14682^2 + 17^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215561413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215561419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107780706 + 107780707.

It is an arithmetic number, because the mean of its divisors is an integer number (107780707).

Almost surely, 2^215561413 is an apocalyptic number.

It is an amenable number.

215561413 is a deficient number, since it is larger than the sum of its proper divisors (1).

215561413 is an equidigital number, since it uses as much as digits as its factorization.

215561413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3600, while the sum is 28.

The square root of 215561413 is about 14682.0098419801. The cubic root of 215561413 is about 599.5936257547.

The spelling of 215561413 in words is "two hundred fifteen million, five hundred sixty-one thousand, four hundred thirteen".