865780537 has 2 divisors, whose sum is σ = 865780538. Its totient is φ = 865780536.

The previous prime is 865780459. The next prime is 865780567. The reversal of 865780537 is 735087568.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 855211536 + 10569001 = 29244^2 + 3251^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-865780537 is a prime.

It is not a weakly prime, because it can be changed into another prime (865780567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432890268 + 432890269.

It is an arithmetic number, because the mean of its divisors is an integer number (432890269).

Almost surely, 2^865780537 is an apocalyptic number.

It is an amenable number.

865780537 is a deficient number, since it is larger than the sum of its proper divisors (1).

865780537 is an equidigital number, since it uses as much as digits as its factorization.

865780537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1411200, while the sum is 49.

The square root of 865780537 is about 29424.1488746913. The cubic root of 865780537 is about 953.0944476054.

The spelling of 865780537 in words is "eight hundred sixty-five million, seven hundred eighty thousand, five hundred thirty-seven".