215689741 has 2 divisors, whose sum is σ = 215689742. Its totient is φ = 215689740.

The previous prime is 215689709. The next prime is 215689769. The reversal of 215689741 is 147986512.

215689741 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., 159289641 + 56400100 = 12621^2 + 7510^2 .

It is a cyclic number.

It is not a de Polignac number, because 215689741 - 2⁵ = 215689709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215686741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107844870 + 107844871.

It is an arithmetic number, because the mean of its divisors is an integer number (107844871).

Almost surely, 2^215689741 is an apocalyptic number.

It is an amenable number.

215689741 is a deficient number, since it is larger than the sum of its proper divisors (1).

215689741 is an equidigital number, since it uses as much as digits as its factorization.

215689741 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 43.

The square root of 215689741 is about 14686.3794381052. The cubic root of 215689741 is about 599.7125854916.

The spelling of 215689741 in words is "two hundred fifteen million, six hundred eighty-nine thousand, seven hundred forty-one".