723051421 has 4 divisors (see below), whose sum is σ = 723899932. Its totient is φ = 722202912.

The previous prime is 723051419. The next prime is 723051457. The reversal of 723051421 is 124150327.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 184579396 + 538472025 = 13586^2 + 23205^2 .

It is a cyclic number.

It is not a de Polignac number, because 723051421 - 2¹ = 723051419 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 (723051401) 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, 422976 + ... + 424681.

It is an arithmetic number, because the mean of its divisors is an integer number (180974983).

Almost surely, 2^723051421 is an apocalyptic number.

It is an amenable number.

723051421 is a deficient number, since it is larger than the sum of its proper divisors (848511).

723051421 is an equidigital number, since it uses as much as digits as its factorization.

723051421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848510.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 723051421 is about 26889.6154862802. The cubic root of 723051421 is about 897.5453363297.

The spelling of 723051421 in words is "seven hundred twenty-three million, fifty-one thousand, four hundred twenty-one".