99423561 has 8 divisors (see below), whose sum is σ = 139541920. Its totient is φ = 62793792.

The previous prime is 99423559. The next prime is 99423589. The reversal of 99423561 is 16532499.

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

It is not a de Polignac number, because 99423561 - 2¹ = 99423559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99423521) 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, 872080 + ... + 872193.

It is an arithmetic number, because the mean of its divisors is an integer number (17442740).

Almost surely, 2^99423561 is an apocalyptic number.

It is an amenable number.

99423561 is a deficient number, since it is larger than the sum of its proper divisors (40118359).

99423561 is a wasteful number, since it uses less digits than its factorization.

99423561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1744295.

The product of its digits is 58320, while the sum is 39.

The square root of 99423561 is about 9971.1363946142. The cubic root of 99423561 is about 463.2652998924.

It can be divided in two parts, 99 and 423561, that added together give a triangular number (423660 = T₉₂₀).

The spelling of 99423561 in words is "ninety-nine million, four hundred twenty-three thousand, five hundred sixty-one".