3121123245556 has 6 divisors (see below), whose sum is σ = 5461965679730. Its totient is φ = 1560561622776.

The previous prime is 3121123245547. The next prime is 3121123245563. The reversal of 3121123245556 is 6555423211213.

It can be written as a sum of positive squares in only one way, i.e., 3069798343056 + 51324902500 = 1752084^2 + 226550^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390140405691 + ... + 390140405698.

Almost surely, 2^{3121123245556} is an apocalyptic number.

It is an amenable number.

3121123245556 is a deficient number, since it is larger than the sum of its proper divisors (2340842434174).

3121123245556 is a wasteful number, since it uses less digits than its factorization.

3121123245556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780280811393 (or 780280811391 counting only the distinct ones).

The product of its digits is 216000, while the sum is 40.

Adding to 3121123245556 its reverse (6555423211213), we get a palindrome (9676546456769).

The spelling of 3121123245556 in words is "three trillion, one hundred twenty-one billion, one hundred twenty-three million, two hundred forty-five thousand, five hundred fifty-six".