9725870591 has 16 divisors (see below), whose sum is σ = 10286757888. Its totient is φ = 9181015200.

The previous prime is 9725870587. The next prime is 9725870593. The reversal of 9725870591 is 1950785279.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 9725870591 - 2² = 9725870587 is a prime.

It is a Smith number, since the sum of its digits (53) 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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9725870593) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1089950 + ... + 1098836.

It is an arithmetic number, because the mean of its divisors is an integer number (642922368).

Almost surely, 2^9725870591 is an apocalyptic number.

9725870591 is a deficient number, since it is larger than the sum of its proper divisors (560887297).

9725870591 is a wasteful number, since it uses less digits than its factorization.

9725870591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9782.

The product of its (nonzero) digits is 1587600, while the sum is 53.

The square root of 9725870591 is about 98619.8285893866. The cubic root of 9725870591 is about 2134.5655477842.

The spelling of 9725870591 in words is "nine billion, seven hundred twenty-five million, eight hundred seventy thousand, five hundred ninety-one".