97991144 has 16 divisors (see below), whose sum is σ = 185137920.
Its totient is φ = 48621040.
The previous prime is 97991141. The next prime is 97991171. The reversal of 97991144 is 44119979.
It is a happy number.
It is a junction number, because it is equal to n+sod(n) for n = 97991095 and 97991104.
It is not an unprimeable number, because it can be changed into a prime (97991141) 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, 45704 + ... + 47799.
It is an arithmetic number, because the mean of its divisors is an integer number (11571120).
Almost surely, 297991144 is an apocalyptic number.
It is an amenable number.
97991144 is a deficient number, since it is larger than the sum of its proper divisors (87146776).
97991144 is a wasteful number, since it uses less digits than its factorization.
97991144 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 93640 (or 93636 counting only the distinct ones).
The product of its digits is 81648, while the sum is 44.
The square root of 97991144 is about 9899.0476309593.
The cubic root of 97991144 is about 461.0297410243.
The spelling of 97991144 in words is "ninety-seven million, nine hundred ninety-one thousand, one hundred forty-four".