3121601540 has 24 divisors (see below), whose sum is σ = 6940973592. Its totient is φ = 1175191040.

The previous prime is 3121601503. The next prime is 3121601563. The reversal of 3121601540 is 451061213.

It can be written as a sum of positive squares in 4 ways, for example, as 1293697024 + 1827904516 = 35968^2 + 42754^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4590251 + ... + 4590930.

It is an arithmetic number, because the mean of its divisors is an integer number (289207233).

Almost surely, 2^3121601540 is an apocalyptic number.

It is an amenable number.

3121601540 is an abundant number, since it is smaller than the sum of its proper divisors (3819372052).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3121601540 is a wasteful number, since it uses less digits than its factorization.

3121601540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9181207 (or 9181205 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 3121601540 is about 55871.2944185116. The cubic root of 3121601540 is about 1461.4786951468.

Adding to 3121601540 its reverse (451061213), we get a palindrome (3572662753).

The spelling of 3121601540 in words is "three billion, one hundred twenty-one million, six hundred one thousand, five hundred forty".