999972167 has 2 divisors, whose sum is σ = 999972168. Its totient is φ = 999972166.

The previous prime is 999972107. The next prime is 999972187. The reversal of 999972167 is 761279999.

It is a strong prime.

It is an emirp because it is prime and its reverse (761279999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999972167 - 2¹⁴ = 999955783 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999972107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499986083 + 499986084.

It is an arithmetic number, because the mean of its divisors is an integer number (499986084).

Almost surely, 2^999972167 is an apocalyptic number.

999972167 is a deficient number, since it is larger than the sum of its proper divisors (1).

999972167 is an equidigital number, since it uses as much as digits as its factorization.

999972167 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3857868, while the sum is 59.

The square root of 999972167 is about 31622.3365202510. The cubic root of 999972167 is about 999.9907222473.

The spelling of 999972167 in words is "nine hundred ninety-nine million, nine hundred seventy-two thousand, one hundred sixty-seven".