721140131 has 4 divisors (see below), whose sum is σ = 721220232. Its totient is φ = 721060032.

The previous prime is 721140127. The next prime is 721140151. The reversal of 721140131 is 131041127.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 721140131 - 2² = 721140127 is a prime.

It is a super-2 number, since 2×721140131² = 1040086177077394322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721140151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24545 + ... + 45218.

It is an arithmetic number, because the mean of its divisors is an integer number (180305058).

Almost surely, 2^721140131 is an apocalyptic number.

721140131 is a deficient number, since it is larger than the sum of its proper divisors (80101).

721140131 is a wasteful number, since it uses less digits than its factorization.

721140131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80100.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 721140131 is about 26854.0524129972. The cubic root of 721140131 is about 896.7537913405.

Adding to 721140131 its reverse (131041127), we get a palindrome (852181258).

The spelling of 721140131 in words is "seven hundred twenty-one million, one hundred forty thousand, one hundred thirty-one".