999879707261 has 2 divisors, whose sum is σ = 999879707262. Its totient is φ = 999879707260.

The previous prime is 999879707257. The next prime is 999879707291. The reversal of 999879707261 is 162707978999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 671858908900 + 328020798361 = 819670^2 + 572731^2 .

It is a cyclic number.

It is not a de Polignac number, because 999879707261 - 2² = 999879707257 is a prime.

It is a super-2 number, since 2×999879707261² (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 (999879707291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499939853630 + 499939853631.

It is an arithmetic number, because the mean of its divisors is an integer number (499939853631).

Almost surely, 2^999879707261 is an apocalyptic number.

It is an amenable number.

999879707261 is a deficient number, since it is larger than the sum of its proper divisors (1).

999879707261 is an equidigital number, since it uses as much as digits as its factorization.

999879707261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216040608, while the sum is 74.

The spelling of 999879707261 in words is "nine hundred ninety-nine billion, eight hundred seventy-nine million, seven hundred seven thousand, two hundred sixty-one".