8537782217 has 2 divisors, whose sum is σ = 8537782218. Its totient is φ = 8537782216.

The previous prime is 8537782111. The next prime is 8537782241. The reversal of 8537782217 is 7122877358.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5631601936 + 2906180281 = 75044^2 + 53909^2 .

It is a cyclic number.

It is not a de Polignac number, because 8537782217 - 2²² = 8533587913 is a prime.

It is not a weakly prime, because it can be changed into another prime (8537782417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4268891108 + 4268891109.

It is an arithmetic number, because the mean of its divisors is an integer number (4268891109).

Almost surely, 2^8537782217 is an apocalyptic number.

It is an amenable number.

8537782217 is a deficient number, since it is larger than the sum of its proper divisors (1).

8537782217 is an equidigital number, since it uses as much as digits as its factorization.

8537782217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1317120, while the sum is 50.

The square root of 8537782217 is about 92400.1202217833. The cubic root of 8537782217 is about 2043.8468852598.

The spelling of 8537782217 in words is "eight billion, five hundred thirty-seven million, seven hundred eighty-two thousand, two hundred seventeen".