721252148491 has 4 divisors (see below), whose sum is σ = 824288169712. Its totient is φ = 618216127272.

The previous prime is 721252148417. The next prime is 721252148501. The reversal of 721252148491 is 194841252127.

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 721252148491 - 2¹¹ = 721252146443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (721252128491) 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, 51518010600 + ... + 51518010613.

It is an arithmetic number, because the mean of its divisors is an integer number (206072042428).

Almost surely, 2^721252148491 is an apocalyptic number.

721252148491 is a deficient number, since it is larger than the sum of its proper divisors (103036021221).

721252148491 is a wasteful number, since it uses less digits than its factorization.

721252148491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103036021220.

The product of its digits is 322560, while the sum is 46.

The spelling of 721252148491 in words is "seven hundred twenty-one billion, two hundred fifty-two million, one hundred forty-eight thousand, four hundred ninety-one".