3121554013 has 4 divisors (see below), whose sum is σ = 3121810848. Its totient is φ = 3121297180.

The previous prime is 3121553921. The next prime is 3121554017. The reversal of 3121554013 is 3104551213.

It is a happy number.

3121554013 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 3104551213 = 647 ⋅4798379.

It is a cyclic number.

It is not a de Polignac number, because 3121554013 - 2¹³ = 3121545821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121554017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109231 + ... + 134812.

It is an arithmetic number, because the mean of its divisors is an integer number (780452712).

Almost surely, 2^3121554013 is an apocalyptic number.

It is an amenable number.

3121554013 is a deficient number, since it is larger than the sum of its proper divisors (256835).

3121554013 is a wasteful number, since it uses less digits than its factorization.

3121554013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256834.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 3121554013 is about 55870.8690911462. The cubic root of 3121554013 is about 1461.4712780085.

The spelling of 3121554013 in words is "three billion, one hundred twenty-one million, five hundred fifty-four thousand, thirteen".