999959557 has 2 divisors, whose sum is σ = 999959558. Its totient is φ = 999959556.

The previous prime is 999959507. The next prime is 999959561. The reversal of 999959557 is 755959999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 601917156 + 398042401 = 24534^2 + 19951^2 .

It is a cyclic number.

It is not a de Polignac number, because 999959557 - 2¹¹ = 999957509 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 999959492 and 999959501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999959507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499979778 + 499979779.

It is an arithmetic number, because the mean of its divisors is an integer number (499979779).

Almost surely, 2^999959557 is an apocalyptic number.

It is an amenable number.

999959557 is a deficient number, since it is larger than the sum of its proper divisors (1).

999959557 is an equidigital number, since it uses as much as digits as its factorization.

999959557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51667875, while the sum is 67.

The square root of 999959557 is about 31622.1371352412. The cubic root of 999959557 is about 999.9865188183.

The spelling of 999959557 in words is "nine hundred ninety-nine million, nine hundred fifty-nine thousand, five hundred fifty-seven".