721364161 has 8 divisors (see below), whose sum is σ = 829475264.
Its totient is φ = 614517840.
The previous prime is 721364153. The next prime is 721364167. The reversal of 721364161 is 161463127.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is not a de Polignac number, because 721364161 - 23 = 721364153 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (721364167) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 314970 + ... + 317251.
It is an arithmetic number, because the mean of its divisors is an integer number (103684408).
Almost surely, 2721364161 is an apocalyptic number.
It is an amenable number.
721364161 is a deficient number, since it is larger than the sum of its proper divisors (108111103).
721364161 is a wasteful number, since it uses less digits than its factorization.
721364161 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 632391.
The product of its digits is 6048, while the sum is 31.
The square root of 721364161 is about 26858.2233403477.
The cubic root of 721364161 is about 896.8466438218.
The spelling of 721364161 in words is "seven hundred twenty-one million, three hundred sixty-four thousand, one hundred sixty-one".