1987287241 has 3 divisors (see below), whose sum is σ = 1987331821. Its totient is φ = 1987242662.

The previous prime is 1987287227. The next prime is 1987287283. The reversal of 1987287241 is 1427827891.

The square root of 1987287241 is 44579.

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 a de Polignac number, because none of the positive numbers 2^k-1987287241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1987285241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 22290 + ... + 66868.

Almost surely, 2^1987287241 is an apocalyptic number.

1987287241 is the 44579-th square number.

1987287241 is the 22290-th centered octagonal number.

It is an amenable number.

1987287241 is a deficient number, since it is larger than the sum of its proper divisors (44580).

1987287241 is an frugal number, since it uses more digits than its factorization.

1987287241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89158 (or 44579 counting only the distinct ones).

The product of its digits is 451584, while the sum is 49.

The cubic root of 1987287241 is about 1257.2458615811.

Multiplying 1987287241 by its sum of digits (49), we get a square (97377074809 = 312053²).

Multiplying 1987287241 by its product of digits (451584), we get a square (897427121439744 = 29957088²).

The spelling of 1987287241 in words is "one billion, nine hundred eighty-seven million, two hundred eighty-seven thousand, two hundred forty-one".