1987554725 has 24 divisors (see below), whose sum is σ = 2656783080. Its totient is φ = 1466277120.

The previous prime is 1987554713. The next prime is 1987554733. The reversal of 1987554725 is 5274557891.

It is a Cunningham number, because it is equal to 44582²+1.

It can be written as a sum of positive squares in 12 ways, for example, as 1238054596 + 749500129 = 35186^2 + 27377^2 .

It is not a de Polignac number, because 1987554725 - 2¹⁸ = 1987292581 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 412631 + ... + 417419.

It is an arithmetic number, because the mean of its divisors is an integer number (110699295).

Almost surely, 2^1987554725 is an apocalyptic number.

It is an amenable number.

1987554725 is a deficient number, since it is larger than the sum of its proper divisors (669228355).

1987554725 is a wasteful number, since it uses less digits than its factorization.

1987554725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6089 (or 6084 counting only the distinct ones).

The product of its digits is 3528000, while the sum is 53.

The square root of 1987554725 is about 44582.0000112153. Note that the first 4 decimals coincide. The cubic root of 1987554725 is about 1257.3022664561.

The spelling of 1987554725 in words is "one billion, nine hundred eighty-seven million, five hundred fifty-four thousand, seven hundred twenty-five".