9625991 has 4 divisors (see below), whose sum is σ = 9637512. Its totient is φ = 9614472.

The previous prime is 9625981. The next prime is 9625997. The reversal of 9625991 is 1995269.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1995269 = 599 ⋅3331.

It is a cyclic number.

It is not a de Polignac number, because 9625991 - 2¹⁸ = 9363847 is a prime.

It is an Ulam 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 (9625997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4400 + ... + 6213.

It is an arithmetic number, because the mean of its divisors is an integer number (2409378).

Almost surely, 2^9625991 is an apocalyptic number.

9625991 is a deficient number, since it is larger than the sum of its proper divisors (11521).

9625991 is a wasteful number, since it uses less digits than its factorization.

9625991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11520.

The product of its digits is 43740, while the sum is 41.

The square root of 9625991 is about 3102.5781214983. The cubic root of 9625991 is about 212.7233434935.

The spelling of 9625991 in words is "nine million, six hundred twenty-five thousand, nine hundred ninety-one".