999860761331 has 2 divisors, whose sum is σ = 999860761332. Its totient is φ = 999860761330.

The previous prime is 999860761313. The next prime is 999860761337. The reversal of 999860761331 is 133167068999.

Together with previous prime (999860761313) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999860761331 - 2¹⁰ = 999860760307 is a prime.

It is a super-2 number, since 2×999860761331² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (999860761337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499930380665 + 499930380666.

It is an arithmetic number, because the mean of its divisors is an integer number (499930380666).

Almost surely, 2^999860761331 is an apocalyptic number.

999860761331 is a deficient number, since it is larger than the sum of its proper divisors (1).

999860761331 is an equidigital number, since it uses as much as digits as its factorization.

999860761331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13226976, while the sum is 62.

The spelling of 999860761331 in words is "nine hundred ninety-nine billion, eight hundred sixty million, seven hundred sixty-one thousand, three hundred thirty-one".