864217537 has 2 divisors, whose sum is σ = 864217538. Its totient is φ = 864217536.

The previous prime is 864217513. The next prime is 864217553. The reversal of 864217537 is 735712468.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 855211536 + 9006001 = 29244^2 + 3001^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-864217537 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 864217493 and 864217502.

It is not a weakly prime, because it can be changed into another prime (864217507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432108768 + 432108769.

It is an arithmetic number, because the mean of its divisors is an integer number (432108769).

Almost surely, 2^864217537 is an apocalyptic number.

It is an amenable number.

864217537 is a deficient number, since it is larger than the sum of its proper divisors (1).

864217537 is an equidigital number, since it uses as much as digits as its factorization.

864217537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 282240, while the sum is 43.

The square root of 864217537 is about 29397.5770600232. The cubic root of 864217537 is about 952.5205593025.

The spelling of 864217537 in words is "eight hundred sixty-four million, two hundred seventeen thousand, five hundred thirty-seven".