999994651 has 2 divisors, whose sum is σ = 999994652. Its totient is φ = 999994650.

The previous prime is 999994649. The next prime is 999994691. The reversal of 999994651 is 156499999.

It is a weak prime.

It is an emirp because it is prime and its reverse (156499999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999994651 - 2¹ = 999994649 is a prime.

It is a super-2 number, since 2×999994651² = 1999978604057223602, which contains 22 as substring.

Together with 999994649, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 999994651.

It is not a weakly prime, because it can be changed into another prime (999994691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499997325 + 499997326.

It is an arithmetic number, because the mean of its divisors is an integer number (499997326).

Almost surely, 2^999994651 is an apocalyptic number.

999994651 is a deficient number, since it is larger than the sum of its proper divisors (1).

999994651 is an equidigital number, since it uses as much as digits as its factorization.

999994651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7085880, while the sum is 61.

The square root of 999994651 is about 31622.6920264547. The cubic root of 999994651 is about 999.9982169968.

The spelling of 999994651 in words is "nine hundred ninety-nine million, nine hundred ninety-four thousand, six hundred fifty-one".