721204881 has 4 divisors (see below), whose sum is σ = 961606512. Its totient is φ = 480803252.

The previous prime is 721204879. The next prime is 721204927. The reversal of 721204881 is 188402127.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 188402127 = 3 ⋅62800709.

It is a cyclic number.

It is not a de Polignac number, because 721204881 - 2¹ = 721204879 is a prime.

It is a super-2 number, since 2×721204881² = 1040272960756448322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (721204811) 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 in 3 ways as a sum of consecutive naturals, for example, 120200811 + ... + 120200816.

It is an arithmetic number, because the mean of its divisors is an integer number (240401628).

Almost surely, 2^721204881 is an apocalyptic number.

It is an amenable number.

721204881 is a deficient number, since it is larger than the sum of its proper divisors (240401631).

721204881 is a wasteful number, since it uses less digits than its factorization.

721204881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240401630.

The product of its (nonzero) digits is 7168, while the sum is 33.

The square root of 721204881 is about 26855.2579767911. The cubic root of 721204881 is about 896.7806298922.

The spelling of 721204881 in words is "seven hundred twenty-one million, two hundred four thousand, eight hundred eighty-one".