1971163985 has 32 divisors (see below), whose sum is σ = 2794881024. Its totient is φ = 1306008000.

The previous prime is 1971163979. The next prime is 1971164023. The reversal of 1971163985 is 5893611791.

It is not a de Polignac number, because 1971163985 - 2⁶ = 1971163921 is a prime.

It is a super-2 number, since 2×1971163985² = 7770974911522160450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1052600 + ... + 1054470.

It is an arithmetic number, because the mean of its divisors is an integer number (87340032).

Almost surely, 2^1971163985 is an apocalyptic number.

It is an amenable number.

1971163985 is a deficient number, since it is larger than the sum of its proper divisors (823717039).

1971163985 is a wasteful number, since it uses less digits than its factorization.

1971163985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2885.

The product of its digits is 408240, while the sum is 50.

The square root of 1971163985 is about 44397.7925690005. The cubic root of 1971163985 is about 1253.8365295857.

The spelling of 1971163985 in words is "one billion, nine hundred seventy-one million, one hundred sixty-three thousand, nine hundred eighty-five".