3121651481 has 16 divisors (see below), whose sum is σ = 3449431440. Its totient is φ = 2806625280.

The previous prime is 3121651459. The next prime is 3121651501. The reversal of 3121651481 is 1841561213.

It can be written as a sum of positive squares in 8 ways, for example, as 1007491081 + 2114160400 = 31741^2 + 45980^2 .

It is a cyclic number.

It is not a de Polignac number, because 3121651481 - 2¹⁰ = 3121650457 is a prime.

It is a super-2 number, since 2×3121651481² = 19489415937658986722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3121651441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 343565 + ... + 352533.

It is an arithmetic number, because the mean of its divisors is an integer number (215589465).

Almost surely, 2^3121651481 is an apocalyptic number.

It is an amenable number.

3121651481 is a deficient number, since it is larger than the sum of its proper divisors (327779959).

3121651481 is a wasteful number, since it uses less digits than its factorization.

3121651481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9676.

The product of its digits is 5760, while the sum is 32.

The square root of 3121651481 is about 55871.7413456928. The cubic root of 3121651481 is about 1461.4864889365.

The spelling of 3121651481 in words is "three billion, one hundred twenty-one million, six hundred fifty-one thousand, four hundred eighty-one".