731121617 has 2 divisors, whose sum is σ = 731121618. Its totient is φ = 731121616.

The previous prime is 731121593. The next prime is 731121641. The reversal of 731121617 is 716121137.

It is a balanced prime because it is at equal distance from previous prime (731121593) and next prime (731121641).

It can be written as a sum of positive squares in only one way, i.e., 647142721 + 83978896 = 25439^2 + 9164^2 .

It is a cyclic number.

It is not a de Polignac number, because 731121617 - 2²⁴ = 714344401 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 731121617.

It is not a weakly prime, because it can be changed into another prime (731121317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 365560808 + 365560809.

It is an arithmetic number, because the mean of its divisors is an integer number (365560809).

Almost surely, 2^731121617 is an apocalyptic number.

It is an amenable number.

731121617 is a deficient number, since it is larger than the sum of its proper divisors (1).

731121617 is an equidigital number, since it uses as much as digits as its factorization.

731121617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1764, while the sum is 29.

The square root of 731121617 is about 27039.2606592710. The cubic root of 731121617 is about 900.8722477912.

The spelling of 731121617 in words is "seven hundred thirty-one million, one hundred twenty-one thousand, six hundred seventeen".