3121855216061 has 4 divisors (see below), whose sum is σ = 3136650738624. Its totient is φ = 3107059693500.

The previous prime is 3121855216031. The next prime is 3121855216069. The reversal of 3121855216061 is 1606125581213.

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.

It is a cyclic number.

It is not a de Polignac number, because 3121855216061 - 2³⁸ = 2846977309117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121855216069) 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, 7397760965 + ... + 7397761386.

It is an arithmetic number, because the mean of its divisors is an integer number (784162684656).

Almost surely, 2^{3121855216061} is an apocalyptic number.

It is an amenable number.

3121855216061 is a deficient number, since it is larger than the sum of its proper divisors (14795522563).

3121855216061 is a wasteful number, since it uses less digits than its factorization.

3121855216061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14795522562.

The product of its (nonzero) digits is 86400, while the sum is 41.

The spelling of 3121855216061 in words is "three trillion, one hundred twenty-one billion, eight hundred fifty-five million, two hundred sixteen thousand, sixty-one".