9631725581 has 8 divisors (see below), whose sum is σ = 10199659320. Its totient is φ = 9063943168.

The previous prime is 9631725577. The next prime is 9631725661. The reversal of 9631725581 is 1855271369.

It can be written as a sum of positive squares in 4 ways, for example, as 2991105481 + 6640620100 = 54691^2 + 81490^2 .

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 9631725581 - 2² = 9631725577 is a prime.

It is a super-2 number, since 2×9631725581² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9631725511) 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, 109685 + ... + 176901.

It is an arithmetic number, because the mean of its divisors is an integer number (1274957415).

Almost surely, 2^9631725581 is an apocalyptic number.

It is an amenable number.

9631725581 is a deficient number, since it is larger than the sum of its proper divisors (567933739).

9631725581 is a wasteful number, since it uses less digits than its factorization.

9631725581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75663.

The product of its digits is 453600, while the sum is 47.

The square root of 9631725581 is about 98141.3551006914. The cubic root of 9631725581 is about 2127.6557765862.

The spelling of 9631725581 in words is "nine billion, six hundred thirty-one million, seven hundred twenty-five thousand, five hundred eighty-one".