991553102471 has 8 divisors (see below), whose sum is σ = 992063600640. Its totient is φ = 991042719768.

The previous prime is 991553102447. The next prime is 991553102483. The reversal of 991553102471 is 174201355199.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-991553102471 is a prime.

It is a super-3 number, since 3×991553102471³ (a number of 37 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 (991553102401) 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, 20892050 + ... + 20939456.

It is an arithmetic number, because the mean of its divisors is an integer number (124007950080).

Almost surely, 2^991553102471 is an apocalyptic number.

991553102471 is a deficient number, since it is larger than the sum of its proper divisors (510498169).

991553102471 is a wasteful number, since it uses less digits than its factorization.

991553102471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57733.

The product of its (nonzero) digits is 340200, while the sum is 47.

The spelling of 991553102471 in words is "nine hundred ninety-one billion, five hundred fifty-three million, one hundred two thousand, four hundred seventy-one".