991064471 has 4 divisors (see below), whose sum is σ = 993430200. Its totient is φ = 988698744.

The previous prime is 991064449. The next prime is 991064479. The reversal of 991064471 is 174460199.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 991064471 - 2¹⁴ = 991048087 is a prime.

It is a super-3 number, since 3×991064471³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991064479) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1182236 + ... + 1183073.

It is an arithmetic number, because the mean of its divisors is an integer number (248357550).

Almost surely, 2^991064471 is an apocalyptic number.

991064471 is a deficient number, since it is larger than the sum of its proper divisors (2365729).

991064471 is a wasteful number, since it uses less digits than its factorization.

991064471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2365728.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 991064471 is about 31481.1764551454. The cubic root of 991064471 is about 997.0125745096.

The spelling of 991064471 in words is "nine hundred ninety-one million, sixty-four thousand, four hundred seventy-one".