999245651 has 2 divisors, whose sum is σ = 999245652. Its totient is φ = 999245650.

The previous prime is 999245647. The next prime is 999245677. The reversal of 999245651 is 156542999.

It is a weak prime.

It is an emirp because it is prime and its reverse (156542999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999245651 - 2² = 999245647 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 999245651.

It is not a weakly prime, because it can be changed into another prime (999245251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499622825 + 499622826.

It is an arithmetic number, because the mean of its divisors is an integer number (499622826).

Almost surely, 2^999245651 is an apocalyptic number.

999245651 is a deficient number, since it is larger than the sum of its proper divisors (1).

999245651 is an equidigital number, since it uses as much as digits as its factorization.

999245651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 874800, while the sum is 50.

The square root of 999245651 is about 31610.8470465440. The cubic root of 999245651 is about 999.7484870799.

The spelling of 999245651 in words is "nine hundred ninety-nine million, two hundred forty-five thousand, six hundred fifty-one".