1988774037121 has 3 divisors (see below), whose sum is σ = 1988775447361. Its totient is φ = 1988772626882.

The previous prime is 1988774037119. The next prime is 1988774037163. The reversal of 1988774037121 is 1217304778891.

The square root of 1988774037121 is 1410239.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 1988774037121 - 2¹ = 1988774037119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1988774037521) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 705120 + ... + 2115358.

Almost surely, 2^{1988774037121} is an apocalyptic number.

1988774037121 is the 1410239-th square number.

1988774037121 is the 705120-th centered octagonal number.

It is an amenable number.

1988774037121 is a deficient number, since it is larger than the sum of its proper divisors (1410240).

1988774037121 is an frugal number, since it uses more digits than its factorization.

1988774037121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2820478 (or 1410239 counting only the distinct ones).

The product of its (nonzero) digits is 4741632, while the sum is 58.

The spelling of 1988774037121 in words is "one trillion, nine hundred eighty-eight billion, seven hundred seventy-four million, thirty-seven thousand, one hundred twenty-one".