999961943 has 2 divisors, whose sum is σ = 999961944. Its totient is φ = 999961942.

The previous prime is 999961939. The next prime is 999961979. The reversal of 999961943 is 349169999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999961943 - 2² = 999961939 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999961643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499980971 + 499980972.

It is an arithmetic number, because the mean of its divisors is an integer number (499980972).

Almost surely, 2^999961943 is an apocalyptic number.

999961943 is a deficient number, since it is larger than the sum of its proper divisors (1).

999961943 is an equidigital number, since it uses as much as digits as its factorization.

999961943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4251528, while the sum is 59.

The square root of 999961943 is about 31622.1748619541. The cubic root of 999961943 is about 999.9873141724.

The spelling of 999961943 in words is "nine hundred ninety-nine million, nine hundred sixty-one thousand, nine hundred forty-three".