999621827 has 2 divisors, whose sum is σ = 999621828. Its totient is φ = 999621826.

The previous prime is 999621809. The next prime is 999621841. The reversal of 999621827 is 728126999.

It is a strong prime.

It is an emirp because it is prime and its reverse (728126999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999621827 - 2¹⁶ = 999556291 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (999621127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499810913 + 499810914.

It is an arithmetic number, because the mean of its divisors is an integer number (499810914).

Almost surely, 2^999621827 is an apocalyptic number.

999621827 is a deficient number, since it is larger than the sum of its proper divisors (1).

999621827 is an equidigital number, since it uses as much as digits as its factorization.

999621827 is an evil number, because the sum of its binary digits is even.

The product of its digits is 979776, while the sum is 53.

The square root of 999621827 is about 31616.7965961133. The cubic root of 999621827 is about 999.8739264395.

The spelling of 999621827 in words is "nine hundred ninety-nine million, six hundred twenty-one thousand, eight hundred twenty-seven".