1554554512121 has 12 divisors (see below), whose sum is σ = 1683735643260. Its totient is φ = 1434631161600.

The previous prime is 1554554512073. The next prime is 1554554512153. The reversal of 1554554512121 is 1212154554551.

It can be written as a sum of positive squares in 6 ways, for example, as 307231861225 + 1247322650896 = 554285^2 + 1116836^2 .

It is not a de Polignac number, because 1554554512121 - 2³⁸ = 1279676605177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1554554512171) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 384836 + ... + 1804773.

It is an arithmetic number, because the mean of its divisors is an integer number (140311303605).

Almost surely, 2^{1554554512121} is an apocalyptic number.

It is an amenable number.

1554554512121 is a deficient number, since it is larger than the sum of its proper divisors (129181131139).

1554554512121 is a wasteful number, since it uses less digits than its factorization.

1554554512121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2193836 (or 2193823 counting only the distinct ones).

The product of its digits is 200000, while the sum is 41.

The spelling of 1554554512121 in words is "one trillion, five hundred fifty-four billion, five hundred fifty-four million, five hundred twelve thousand, one hundred twenty-one".