999473661 has 20 divisors (see below), whose sum is σ = 1544528700. Its totient is φ = 643337856.

The previous prime is 999473623. The next prime is 999473693. The reversal of 999473661 is 166374999.

It can be written as a sum of positive squares in 2 ways, for example, as 413349561 + 586124100 = 20331^2 + 24210^2 .

It is not a de Polignac number, because 999473661 - 2²¹ = 997376509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 999473598 and 999473607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999473611) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 210396 + ... + 215093.

It is an arithmetic number, because the mean of its divisors is an integer number (77226435).

Almost surely, 2^999473661 is an apocalyptic number.

It is an amenable number.

999473661 is a deficient number, since it is larger than the sum of its proper divisors (545055039).

999473661 is a wasteful number, since it uses less digits than its factorization.

999473661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425530 (or 425521 counting only the distinct ones).

The product of its digits is 2204496, while the sum is 54.

The square root of 999473661 is about 31614.4533560206. The cubic root of 999473661 is about 999.8245228762.

The spelling of 999473661 in words is "nine hundred ninety-nine million, four hundred seventy-three thousand, six hundred sixty-one".