999521147 has 2 divisors, whose sum is σ = 999521148. Its totient is φ = 999521146.

The previous prime is 999521119. The next prime is 999521203. The reversal of 999521147 is 741125999.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999521147 is a prime.

It is not a weakly prime, because it can be changed into another prime (999521447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499760573 + 499760574.

It is an arithmetic number, because the mean of its divisors is an integer number (499760574).

Almost surely, 2^999521147 is an apocalyptic number.

999521147 is a deficient number, since it is larger than the sum of its proper divisors (1).

999521147 is an equidigital number, since it uses as much as digits as its factorization.

999521147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 47.

The square root of 999521147 is about 31615.2043643561. The cubic root of 999521147 is about 999.8403568488.

The spelling of 999521147 in words is "nine hundred ninety-nine million, five hundred twenty-one thousand, one hundred forty-seven".