736865861 has 2 divisors, whose sum is σ = 736865862. Its totient is φ = 736865860.

The previous prime is 736865839. The next prime is 736865863. The reversal of 736865861 is 168568637.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 701985025 + 34880836 = 26495^2 + 5906^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-736865861 is a prime.

Together with 736865863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (736865863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 368432930 + 368432931.

It is an arithmetic number, because the mean of its divisors is an integer number (368432931).

Almost surely, 2^736865861 is an apocalyptic number.

It is an amenable number.

736865861 is a deficient number, since it is larger than the sum of its proper divisors (1).

736865861 is an equidigital number, since it uses as much as digits as its factorization.

736865861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1451520, while the sum is 50.

The square root of 736865861 is about 27145.2732717871. The cubic root of 736865861 is about 903.2254068608.

The spelling of 736865861 in words is "seven hundred thirty-six million, eight hundred sixty-five thousand, eight hundred sixty-one".