999860941531 has 2 divisors, whose sum is σ = 999860941532. Its totient is φ = 999860941530.

The previous prime is 999860941511. The next prime is 999860941559. The reversal of 999860941531 is 135149068999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999860941531 - 2¹⁵ = 999860908763 is a prime.

It is a super-2 number, since 2×999860941531² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (999860941511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499930470765 + 499930470766.

It is an arithmetic number, because the mean of its divisors is an integer number (499930470766).

Almost surely, 2^999860941531 is an apocalyptic number.

999860941531 is the 447183-rd centered decagonal number.

999860941531 is a deficient number, since it is larger than the sum of its proper divisors (1).

999860941531 is an equidigital number, since it uses as much as digits as its factorization.

999860941531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18895680, while the sum is 64.

The spelling of 999860941531 in words is "nine hundred ninety-nine billion, eight hundred sixty million, nine hundred forty-one thousand, five hundred thirty-one".