917321138501 has 2 divisors, whose sum is σ = 917321138502. Its totient is φ = 917321138500.

The previous prime is 917321138429. The next prime is 917321138567. The reversal of 917321138501 is 105831123719.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 854605953601 + 62715184900 = 924449^2 + 250430^2 .

It is a cyclic number.

It is not a de Polignac number, because 917321138501 - 2¹⁰ = 917321137477 is a prime.

It is a super-2 number, since 2×917321138501² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (917321138581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 458660569250 + 458660569251.

It is an arithmetic number, because the mean of its divisors is an integer number (458660569251).

Almost surely, 2^917321138501 is an apocalyptic number.

It is an amenable number.

917321138501 is a deficient number, since it is larger than the sum of its proper divisors (1).

917321138501 is an equidigital number, since it uses as much as digits as its factorization.

917321138501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 41.

The spelling of 917321138501 in words is "nine hundred seventeen billion, three hundred twenty-one million, one hundred thirty-eight thousand, five hundred one".