1641012999 has 16 divisors (see below), whose sum is σ = 2240844672. Its totient is φ = 1067639328.

The previous prime is 1641012983. The next prime is 1641013001. The reversal of 1641012999 is 9992101461.

It is a happy number.

It is not a de Polignac number, because 1641012999 - 2⁴ = 1641012983 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1641012999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1641012979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 163737 + ... + 173469.

It is an arithmetic number, because the mean of its divisors is an integer number (140052792).

Almost surely, 2^1641012999 is an apocalyptic number.

1641012999 is a deficient number, since it is larger than the sum of its proper divisors (599831673).

1641012999 is a wasteful number, since it uses less digits than its factorization.

1641012999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11086.

The product of its (nonzero) digits is 34992, while the sum is 42.

The square root of 1641012999 is about 40509.4186455446. The cubic root of 1641012999 is about 1179.5164635245.

The spelling of 1641012999 in words is "one billion, six hundred forty-one million, twelve thousand, nine hundred ninety-nine".