1671375987 has 12 divisors (see below), whose sum is σ = 2470354744. Its totient is φ = 1088337600.

The previous prime is 1671375973. The next prime is 1671376019. The reversal of 1671375987 is 7895731761.

1671375987 is a `hidden beast` number, since 16 + 7 + 1 + 37 + 598 + 7 = 666.

It is not a de Polignac number, because 1671375987 - 2⁴ = 1671375971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1671375967) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2159014 + ... + 2159787.

Almost surely, 2^1671375987 is an apocalyptic number.

1671375987 is a deficient number, since it is larger than the sum of its proper divisors (798978757).

1671375987 is a wasteful number, since it uses less digits than its factorization.

1671375987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4318850 (or 4318847 counting only the distinct ones).

The product of its digits is 2222640, while the sum is 54.

The square root of 1671375987 is about 40882.4655200735. The cubic root of 1671375987 is about 1186.7467546927.

The spelling of 1671375987 in words is "one billion, six hundred seventy-one million, three hundred seventy-five thousand, nine hundred eighty-seven".