3121664537 has 4 divisors (see below), whose sum is σ = 3121940736. Its totient is φ = 3121388340.

The previous prime is 3121664531. The next prime is 3121664549. The reversal of 3121664537 is 7354661213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7354661213 = 941 ⋅7815793.

It is a cyclic number.

It is not a de Polignac number, because 3121664537 - 2⁴ = 3121664521 is a prime.

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 3121664537.

It is not an unprimeable number, because it can be changed into a prime (3121664531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120389 + ... + 144002.

It is an arithmetic number, because the mean of its divisors is an integer number (780485184).

Almost surely, 2^3121664537 is an apocalyptic number.

It is an amenable number.

3121664537 is a deficient number, since it is larger than the sum of its proper divisors (276199).

3121664537 is a wasteful number, since it uses less digits than its factorization.

3121664537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276198.

The product of its digits is 90720, while the sum is 38.

The square root of 3121664537 is about 55871.8581845995. The cubic root of 3121664537 is about 1461.4885264415.

The spelling of 3121664537 in words is "three billion, one hundred twenty-one million, six hundred sixty-four thousand, five hundred thirty-seven".