1521642987 has 48 divisors (see below), whose sum is σ = 2490153120. Its totient is φ = 889574400.

The previous prime is 1521642929. The next prime is 1521643003. The reversal of 1521642987 is 7892461251.

1521642987 is a `hidden beast` number, since 1 + 5 + 216 + 429 + 8 + 7 = 666.

It is not a de Polignac number, because 1521642987 - 2¹² = 1521638891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1521642887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 173037 + ... + 181617.

It is an arithmetic number, because the mean of its divisors is an integer number (51878190).

Almost surely, 2^1521642987 is an apocalyptic number.

1521642987 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1521642987 is a deficient number, since it is larger than the sum of its proper divisors (968510133).

1521642987 is a wasteful number, since it uses less digits than its factorization.

1521642987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8684 (or 8681 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 1521642987 is about 39008.2425520556. The cubic root of 1521642987 is about 1150.1935369295.

The spelling of 1521642987 in words is "one billion, five hundred twenty-one million, six hundred forty-two thousand, nine hundred eighty-seven".