9671661731 has 4 divisors (see below), whose sum is σ = 9933058032. Its totient is φ = 9410265432.

The previous prime is 9671661683. The next prime is 9671661757. The reversal of 9671661731 is 1371661769.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9671661731 is a prime.

It is a super-2 number, since 2×9671661731² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9671661331) 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, 130698095 + ... + 130698168.

It is an arithmetic number, because the mean of its divisors is an integer number (2483264508).

Almost surely, 2^9671661731 is an apocalyptic number.

9671661731 is a deficient number, since it is larger than the sum of its proper divisors (261396301).

9671661731 is a wasteful number, since it uses less digits than its factorization.

9671661731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261396300.

The product of its digits is 285768, while the sum is 47.

The square root of 9671661731 is about 98344.6070254999. The cubic root of 9671661731 is about 2130.5923639910.

The spelling of 9671661731 in words is "nine billion, six hundred seventy-one million, six hundred sixty-one thousand, seven hundred thirty-one".