999995651 has 2 divisors, whose sum is σ = 999995652. Its totient is φ = 999995650.

The previous prime is 999995629. The next prime is 999995663. The reversal of 999995651 is 156599999.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999995651 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (999995611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499997825 + 499997826.

It is an arithmetic number, because the mean of its divisors is an integer number (499997826).

Almost surely, 2^999995651 is an apocalyptic number.

999995651 is a deficient number, since it is larger than the sum of its proper divisors (1).

999995651 is an equidigital number, since it uses as much as digits as its factorization.

999995651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8857350, while the sum is 62.

The square root of 999995651 is about 31622.7078378813. The cubic root of 999995651 is about 999.9985503312.

The spelling of 999995651 in words is "nine hundred ninety-nine million, nine hundred ninety-five thousand, six hundred fifty-one".