999986261 has 2 divisors, whose sum is σ = 999986262. Its totient is φ = 999986260.

The previous prime is 999986231. The next prime is 999986263. The reversal of 999986261 is 162689999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 874680625 + 125305636 = 29575^2 + 11194^2 .

It is a cyclic number.

It is not a de Polignac number, because 999986261 - 2¹⁴ = 999969877 is a prime.

It is a super-3 number, since 3×999986261³ (a number of 28 digits) contains 333 as substring.

Together with 999986263, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 999986261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999986263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499993130 + 499993131.

It is an arithmetic number, because the mean of its divisors is an integer number (499993131).

Almost surely, 2^999986261 is an apocalyptic number.

It is an amenable number.

999986261 is a deficient number, since it is larger than the sum of its proper divisors (1).

999986261 is an equidigital number, since it uses as much as digits as its factorization.

999986261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3779136, while the sum is 59.

The square root of 999986261 is about 31622.5593682738. The cubic root of 999986261 is about 999.9954203124.

The spelling of 999986261 in words is "nine hundred ninety-nine million, nine hundred eighty-six thousand, two hundred sixty-one".