3130720121 has 8 divisors (see below), whose sum is σ = 3177533064. Its totient is φ = 3084013440.

The previous prime is 3130720097. The next prime is 3130720133. The reversal of 3130720121 is 1210270313.

It can be written as a sum of positive squares in 4 ways, for example, as 196981225 + 2933738896 = 14035^2 + 54164^2 .

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 3130720121 - 2¹⁸ = 3130457977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3130720093 and 3130720102.

It is not an unprimeable number, because it can be changed into a prime (3130722121) 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, 33815 + ... + 86051.

It is an arithmetic number, because the mean of its divisors is an integer number (397191633).

Almost surely, 2^3130720121 is an apocalyptic number.

It is an amenable number.

3130720121 is a deficient number, since it is larger than the sum of its proper divisors (46812943).

3130720121 is an equidigital number, since it uses as much as digits as its factorization.

3130720121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53131.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 3130720121 is about 55952.8383641080. The cubic root of 3130720121 is about 1462.9003645992.

Adding to 3130720121 its reverse (1210270313), we get a palindrome (4340990434).

The spelling of 3130720121 in words is "three billion, one hundred thirty million, seven hundred twenty thousand, one hundred twenty-one".