999911657 has 2 divisors, whose sum is σ = 999911658. Its totient is φ = 999911656.

The previous prime is 999911629. The next prime is 999911659. The reversal of 999911657 is 756119999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 988222096 + 11689561 = 31436^2 + 3419^2 .

It is a cyclic number.

It is not a de Polignac number, because 999911657 - 2¹⁶ = 999846121 is a prime.

Together with 999911659, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (999911659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499955828 + 499955829.

It is an arithmetic number, because the mean of its divisors is an integer number (499955829).

Almost surely, 2^999911657 is an apocalyptic number.

It is an amenable number.

999911657 is a deficient number, since it is larger than the sum of its proper divisors (1).

999911657 is an equidigital number, since it uses as much as digits as its factorization.

999911657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1377810, while the sum is 56.

The square root of 999911657 is about 31621.3797453558. The cubic root of 999911657 is about 999.9705514661.

The spelling of 999911657 in words is "nine hundred ninety-nine million, nine hundred eleven thousand, six hundred fifty-seven".