999411561 has 16 divisors (see below), whose sum is σ = 1505707200. Its totient is φ = 654980544.

The previous prime is 999411559. The next prime is 999411583. The reversal of 999411561 is 165114999.

It is not a de Polignac number, because 999411561 - 2¹ = 999411559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (999411961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 312096 + ... + 315281.

It is an arithmetic number, because the mean of its divisors is an integer number (94106700).

Almost surely, 2^999411561 is an apocalyptic number.

It is an amenable number.

999411561 is a deficient number, since it is larger than the sum of its proper divisors (506295639).

999411561 is a wasteful number, since it uses less digits than its factorization.

999411561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627445 (or 627439 counting only the distinct ones).

The product of its digits is 87480, while the sum is 45.

The square root of 999411561 is about 31613.4711950459. The cubic root of 999411561 is about 999.8038151807.

The spelling of 999411561 in words is "nine hundred ninety-nine million, four hundred eleven thousand, five hundred sixty-one".