999746561 has 4 divisors (see below), whose sum is σ = 1090632624. Its totient is φ = 908860500.

The previous prime is 999746513. The next prime is 999746569. The reversal of 999746561 is 165647999.

999746561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999746561 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 999746497 and 999746506.

It is not an unprimeable number, because it can be changed into a prime (999746569) 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, 45443015 + ... + 45443036.

It is an arithmetic number, because the mean of its divisors is an integer number (272658156).

Almost surely, 2^999746561 is an apocalyptic number.

It is an amenable number.

999746561 is a deficient number, since it is larger than the sum of its proper divisors (90886063).

999746561 is a wasteful number, since it uses less digits than its factorization.

999746561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90886062.

The product of its digits is 3674160, while the sum is 56.

The square root of 999746561 is about 31618.7691253154. The cubic root of 999746561 is about 999.9155131955.

The spelling of 999746561 in words is "nine hundred ninety-nine million, seven hundred forty-six thousand, five hundred sixty-one".