1987033491 has 64 divisors (see below), whose sum is σ = 3185049600. Its totient is φ = 1219857408.

The previous prime is 1987033481. The next prime is 1987033493. The reversal of 1987033491 is 1943307891.

1987033491 is a `hidden beast` number, since 1 + 98 + 70 + 3 + 3 + 491 = 666.

It is not a de Polignac number, because 1987033491 - 2¹¹ = 1987031443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1987033493) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5187886 + ... + 5188268.

It is an arithmetic number, because the mean of its divisors is an integer number (49766400).

Almost surely, 2^1987033491 is an apocalyptic number.

1987033491 is a deficient number, since it is larger than the sum of its proper divisors (1198016109).

1987033491 is a wasteful number, since it uses less digits than its factorization.

1987033491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625 (or 619 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 1987033491 is about 44576.1538381229. The cubic root of 1987033491 is about 1257.1923481432.

It can be divided in two parts, 19870 and 33491, that added together give a square (53361 = 231²).

The spelling of 1987033491 in words is "one billion, nine hundred eighty-seven million, thirty-three thousand, four hundred ninety-one".