722131387 has 4 divisors (see below), whose sum is σ = 723414600. Its totient is φ = 720848176.

The previous prime is 722131381. The next prime is 722131393. The reversal of 722131387 is 783131227.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (722131381) and next prime (722131393).

It is a cyclic number.

It is not a de Polignac number, because 722131387 - 2¹¹ = 722129339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (722131381) 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, 640762 + ... + 641887.

It is an arithmetic number, because the mean of its divisors is an integer number (180853650).

Almost surely, 2^722131387 is an apocalyptic number.

722131387 is a deficient number, since it is larger than the sum of its proper divisors (1283213).

722131387 is a wasteful number, since it uses less digits than its factorization.

722131387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1283212.

The product of its digits is 14112, while the sum is 34.

The square root of 722131387 is about 26872.5024327843. The cubic root of 722131387 is about 897.1644861826.

The spelling of 722131387 in words is "seven hundred twenty-two million, one hundred thirty-one thousand, three hundred eighty-seven".