99591851 has 4 divisors (see below), whose sum is σ = 100226352. Its totient is φ = 98957352.

The previous prime is 99591847. The next prime is 99591853. The reversal of 99591851 is 15819599.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15819599 = 53 ⋅298483.

It is a cyclic number.

It is not a de Polignac number, because 99591851 - 2² = 99591847 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 99591796 and 99591805.

It is not an unprimeable number, because it can be changed into a prime (99591853) 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, 317015 + ... + 317328.

It is an arithmetic number, because the mean of its divisors is an integer number (25056588).

Almost surely, 2^99591851 is an apocalyptic number.

99591851 is a deficient number, since it is larger than the sum of its proper divisors (634501).

99591851 is a wasteful number, since it uses less digits than its factorization.

99591851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634500.

The product of its digits is 145800, while the sum is 47.

The square root of 99591851 is about 9979.5716841957. The cubic root of 99591851 is about 463.5265356588.

The spelling of 99591851 in words is "ninety-nine million, five hundred ninety-one thousand, eight hundred fifty-one".