991164041 has 4 divisors (see below), whose sum is σ = 1132758912. Its totient is φ = 849569172.

The previous prime is 991164011. The next prime is 991164049. The reversal of 991164041 is 140461199.

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: 140461199 = 263 ⋅534073.

It is a cyclic number.

It is not a de Polignac number, because 991164041 - 2¹⁴ = 991147657 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 991163992 and 991164010.

It is not an unprimeable number, because it can be changed into a prime (991164049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70797425 + ... + 70797438.

It is an arithmetic number, because the mean of its divisors is an integer number (283189728).

Almost surely, 2^991164041 is an apocalyptic number.

It is an amenable number.

991164041 is a deficient number, since it is larger than the sum of its proper divisors (141594871).

991164041 is a wasteful number, since it uses less digits than its factorization.

991164041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141594870.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 991164041 is about 31482.7578366318. The cubic root of 991164041 is about 997.0459625889.

The spelling of 991164041 in words is "nine hundred ninety-one million, one hundred sixty-four thousand, forty-one".