991946003 has 2 divisors, whose sum is σ = 991946004. Its totient is φ = 991946002.

The previous prime is 991945943. The next prime is 991946057. The reversal of 991946003 is 300649199.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-991946003 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (991946063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495973001 + 495973002.

It is an arithmetic number, because the mean of its divisors is an integer number (495973002).

Almost surely, 2^991946003 is an apocalyptic number.

991946003 is a deficient number, since it is larger than the sum of its proper divisors (1).

991946003 is an equidigital number, since it uses as much as digits as its factorization.

991946003 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 991946003 is about 31495.1742811498. The cubic root of 991946003 is about 997.3080944802.

The spelling of 991946003 in words is "nine hundred ninety-one million, nine hundred forty-six thousand, three".