1001012399 has 2 divisors, whose sum is σ = 1001012400. Its totient is φ = 1001012398.

The previous prime is 1001012381. The next prime is 1001012407. The reversal of 1001012399 is 9932101001.

It is a strong prime.

It is an emirp because it is prime and its reverse (9932101001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1001012399 - 2⁸ = 1001012143 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001012339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500506199 + 500506200.

It is an arithmetic number, because the mean of its divisors is an integer number (500506200).

Almost surely, 2^1001012399 is an apocalyptic number.

1001012399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001012399 is an equidigital number, since it uses as much as digits as its factorization.

1001012399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 26.

The square root of 1001012399 is about 31638.7799859603. The cubic root of 1001012399 is about 1000.3373525138.

The spelling of 1001012399 in words is "one billion, one million, twelve thousand, three hundred ninety-nine".