167139421 has 2 divisors, whose sum is σ = 167139422. Its totient is φ = 167139420.

The previous prime is 167139403. The next prime is 167139463. The reversal of 167139421 is 124931761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158407396 + 8732025 = 12586^2 + 2955^2 .

It is an emirp because it is prime and its reverse (124931761) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 167139421 - 2⁷ = 167139293 is a prime.

It is equal to p_9351943 and since 167139421 and 9351943 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (167139221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83569710 + 83569711.

It is an arithmetic number, because the mean of its divisors is an integer number (83569711).

Almost surely, 2^167139421 is an apocalyptic number.

It is an amenable number.

167139421 is a deficient number, since it is larger than the sum of its proper divisors (1).

167139421 is an equidigital number, since it uses as much as digits as its factorization.

167139421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 34.

The square root of 167139421 is about 12928.2412183560. The cubic root of 167139421 is about 550.8410504149.

The spelling of 167139421 in words is "one hundred sixty-seven million, one hundred thirty-nine thousand, four hundred twenty-one".