1601841999 has 32 divisors (see below), whose sum is σ = 2298240000. Its totient is φ = 990347904.

The previous prime is 1601841973. The next prime is 1601842019. The reversal of 1601841999 is 9991481061.

It is a happy number.

It is not a de Polignac number, because 1601841999 - 2⁸ = 1601841743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1601841929) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 251152 + ... + 257450.

It is an arithmetic number, because the mean of its divisors is an integer number (71820000).

Almost surely, 2^1601841999 is an apocalyptic number.

1601841999 is a deficient number, since it is larger than the sum of its proper divisors (696398001).

1601841999 is a wasteful number, since it uses less digits than its factorization.

1601841999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6447.

The product of its (nonzero) digits is 139968, while the sum is 48.

The square root of 1601841999 is about 40023.0183644362. The cubic root of 1601841999 is about 1170.0557596335.

The spelling of 1601841999 in words is "one billion, six hundred one million, eight hundred forty-one thousand, nine hundred ninety-nine".