721920167 has 4 divisors (see below), whose sum is σ = 725660880. Its totient is φ = 718179456.

The previous prime is 721920151. The next prime is 721920193. The reversal of 721920167 is 761029127.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 721920167 - 2⁴ = 721920151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721920127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1870067 + ... + 1870452.

It is an arithmetic number, because the mean of its divisors is an integer number (181415220).

Almost surely, 2^721920167 is an apocalyptic number.

721920167 is a deficient number, since it is larger than the sum of its proper divisors (3740713).

721920167 is a wasteful number, since it uses less digits than its factorization.

721920167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3740712.

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

The square root of 721920167 is about 26868.5721057149. The cubic root of 721920167 is about 897.0770055362.

The spelling of 721920167 in words is "seven hundred twenty-one million, nine hundred twenty thousand, one hundred sixty-seven".