1971599161 has 8 divisors (see below), whose sum is σ = 2266750080. Its totient is φ = 1679821728.

The previous prime is 1971599143. The next prime is 1971599177. The reversal of 1971599161 is 1619951791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1971599161 - 2¹¹ = 1971597113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1971590161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 842116 + ... + 844453.

It is an arithmetic number, because the mean of its divisors is an integer number (283343760).

Almost surely, 2^1971599161 is an apocalyptic number.

It is an amenable number.

1971599161 is a deficient number, since it is larger than the sum of its proper divisors (295150919).

1971599161 is a wasteful number, since it uses less digits than its factorization.

1971599161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1686743.

The product of its digits is 153090, while the sum is 49.

The square root of 1971599161 is about 44402.6931728246. The cubic root of 1971599161 is about 1253.9287930776.

The spelling of 1971599161 in words is "one billion, nine hundred seventy-one million, five hundred ninety-nine thousand, one hundred sixty-one".