721318995 has 12 divisors (see below), whose sum is σ = 1250286336. Its totient is φ = 384703440.

The previous prime is 721318973. The next prime is 721318999. The reversal of 721318995 is 599813127.

It is not a de Polignac number, because 721318995 - 2⁷ = 721318867 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 16029311 = 721318995 / (7 + 2 + 1 + 3 + 1 + 8 + 9 + 9 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 721318995.

It is not an unprimeable number, because it can be changed into a prime (721318999) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8014611 + ... + 8014700.

It is an arithmetic number, because the mean of its divisors is an integer number (104190528).

Almost surely, 2^721318995 is an apocalyptic number.

721318995 is a deficient number, since it is larger than the sum of its proper divisors (528967341).

721318995 is a wasteful number, since it uses less digits than its factorization.

721318995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16029322 (or 16029319 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 721318995 is about 26857.3825046299. The cubic root of 721318995 is about 896.8279256656.

The spelling of 721318995 in words is "seven hundred twenty-one million, three hundred eighteen thousand, nine hundred ninety-five".