3130536721 has 8 divisors (see below), whose sum is σ = 3395957544. Its totient is φ = 2868631680.

The previous prime is 3130536719. The next prime is 3130536763. The reversal of 3130536721 is 1276350313.

It can be written as a sum of positive squares in 4 ways, for example, as 996096721 + 2134440000 = 31561^2 + 46200^2 .

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 3130536721 - 2¹ = 3130536719 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (3130536781) 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, 877090 + ... + 880651.

It is an arithmetic number, because the mean of its divisors is an integer number (424494693).

Almost surely, 2^3130536721 is an apocalyptic number.

It is an amenable number.

3130536721 is a deficient number, since it is larger than the sum of its proper divisors (265420823).

3130536721 is a wasteful number, since it uses less digits than its factorization.

3130536721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1757891.

The product of its (nonzero) digits is 11340, while the sum is 31.

The square root of 3130536721 is about 55951.1994598865. The cubic root of 3130536721 is about 1462.8717980974.

The spelling of 3130536721 in words is "three billion, one hundred thirty million, five hundred thirty-six thousand, seven hundred twenty-one".