99191645 has 8 divisors (see below), whose sum is σ = 136034304. Its totient is φ = 68017104.

The previous prime is 99191639. The next prime is 99191671. The reversal of 99191645 is 54619199.

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 99191645 - 2¹² = 99187549 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 99191596 and 99191605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1416989 + ... + 1417058.

It is an arithmetic number, because the mean of its divisors is an integer number (17004288).

Almost surely, 2^99191645 is an apocalyptic number.

It is an amenable number.

99191645 is a deficient number, since it is larger than the sum of its proper divisors (36842659).

99191645 is a wasteful number, since it uses less digits than its factorization.

99191645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2834059.

The product of its digits is 87480, while the sum is 44.

The square root of 99191645 is about 9959.5002384658. The cubic root of 99191645 is about 462.9048143094.

It can be divided in two parts, 9919164 and 5, that multiplied together give a triangular number (49595820 = T₉₉₅₉).

The spelling of 99191645 in words is "ninety-nine million, one hundred ninety-one thousand, six hundred forty-five".