991525223 has 8 divisors (see below), whose sum is σ = 1096656288. Its totient is φ = 890517024.

The previous prime is 991525211. The next prime is 991525229. The reversal of 991525223 is 322525199.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 991525223 - 2¹² = 991521127 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991525229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1030211 + ... + 1031172.

It is an arithmetic number, because the mean of its divisors is an integer number (137082036).

Almost surely, 2^991525223 is an apocalyptic number.

991525223 is a deficient number, since it is larger than the sum of its proper divisors (105131065).

991525223 is a wasteful number, since it uses less digits than its factorization.

991525223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2061433.

The product of its digits is 48600, while the sum is 38.

The square root of 991525223 is about 31488.4935015952. The cubic root of 991525223 is about 997.1670563422.

The spelling of 991525223 in words is "nine hundred ninety-one million, five hundred twenty-five thousand, two hundred twenty-three".