2157135487 has 4 divisors (see below), whose sum is σ = 2323069000. Its totient is φ = 1991201976.

The previous prime is 2157135481. The next prime is 2157135499. The reversal of 2157135487 is 7845317512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2157135487 - 2³¹ = 9651839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157135481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82966737 + ... + 82966762.

It is an arithmetic number, because the mean of its divisors is an integer number (580767250).

Almost surely, 2^2157135487 is an apocalyptic number.

2157135487 is a deficient number, since it is larger than the sum of its proper divisors (165933513).

2157135487 is a wasteful number, since it uses less digits than its factorization.

2157135487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165933512.

The product of its digits is 235200, while the sum is 43.

The square root of 2157135487 is about 46444.9726773523. The cubic root of 2157135487 is about 1292.0891347333.

The spelling of 2157135487 in words is "two billion, one hundred fifty-seven million, one hundred thirty-five thousand, four hundred eighty-seven".