921720167 has 2 divisors, whose sum is σ = 921720168. Its totient is φ = 921720166.

The previous prime is 921720131. The next prime is 921720169. The reversal of 921720167 is 761027129.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 921720167 - 2⁶ = 921720103 is a prime.

Together with 921720169, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (921720169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460860083 + 460860084.

It is an arithmetic number, because the mean of its divisors is an integer number (460860084).

Almost surely, 2^921720167 is an apocalyptic number.

921720167 is a deficient number, since it is larger than the sum of its proper divisors (1).

921720167 is an equidigital number, since it uses as much as digits as its factorization.

921720167 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10584, while the sum is 35.

The square root of 921720167 is about 30359.8446471651. The cubic root of 921720167 is about 973.1946137479.

The spelling of 921720167 in words is "nine hundred twenty-one million, seven hundred twenty thousand, one hundred sixty-seven".