9191364641 has 4 divisors (see below), whose sum is σ = 9211046832. Its totient is φ = 9171682452.

The previous prime is 9191364631. The next prime is 9191364647. The reversal of 9191364641 is 1464631919.

9191364641 = 220² + 221² + ... + 3021².

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1464631919 = 1741 ⋅841259.

It is a cyclic number.

It is not a de Polignac number, because 9191364641 - 2⁶ = 9191364577 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9191364592 and 9191364601.

It is not an unprimeable number, because it can be changed into a prime (9191364647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9840395 + ... + 9841328.

It is an arithmetic number, because the mean of its divisors is an integer number (2302761708).

Almost surely, 2^9191364641 is an apocalyptic number.

It is an amenable number.

9191364641 is a deficient number, since it is larger than the sum of its proper divisors (19682191).

9191364641 is a wasteful number, since it uses less digits than its factorization.

9191364641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19682190.

The product of its digits is 139968, while the sum is 44.

The square root of 9191364641 is about 95871.6049776992. The cubic root of 9191364641 is about 2094.7233086964.

The spelling of 9191364641 in words is "nine billion, one hundred ninety-one million, three hundred sixty-four thousand, six hundred forty-one".