3130721 has 8 divisors (see below), whose sum is σ = 3525888. Its totient is φ = 2754000.

The previous prime is 3130711. The next prime is 3130733. The reversal of 3130721 is 1270313.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3130721 - 2¹⁸ = 2868577 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3130721.

It is not an unprimeable number, because it can be changed into a prime (3130711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4250 + ... + 4931.

It is an arithmetic number, because the mean of its divisors is an integer number (440736).

Almost surely, 2^3130721 is an apocalyptic number.

3130721 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

3130721 is a deficient number, since it is larger than the sum of its proper divisors (395167).

3130721 is a wasteful number, since it uses less digits than its factorization.

3130721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9223.

The product of its (nonzero) digits is 126, while the sum is 17.

The square root of 3130721 is about 1769.3843562098. The cubic root of 3130721 is about 146.2900501510.

The spelling of 3130721 in words is "three million, one hundred thirty thousand, seven hundred twenty-one".