991089582953 has 4 divisors (see below), whose sum is σ = 991129288020. Its totient is φ = 991049877888.

The previous prime is 991089582947. The next prime is 991089583013. The reversal of 991089582953 is 359285980199.

991089582953 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 355301829184 + 635787753769 = 596072^2 + 797363^2 .

It is a cyclic number.

It is not a de Polignac number, because 991089582953 - 2¹⁶ = 991089517417 is a prime.

It is a super-2 number, since 2×991089582953² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (991089582053) 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, 19815068 + ... + 19865021.

It is an arithmetic number, because the mean of its divisors is an integer number (247782322005).

Almost surely, 2^991089582953 is an apocalyptic number.

It is an amenable number.

991089582953 is a deficient number, since it is larger than the sum of its proper divisors (39705067).

991089582953 is a wasteful number, since it uses less digits than its factorization.

991089582953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39705066.

The product of its (nonzero) digits is 62985600, while the sum is 68.

The spelling of 991089582953 in words is "nine hundred ninety-one billion, eighty-nine million, five hundred eighty-two thousand, nine hundred fifty-three".