1600499991 has 8 divisors (see below), whose sum is σ = 2141541760. Its totient is φ = 1063229112.

The previous prime is 1600499987. The next prime is 1600500001. The reversal of 1600499991 is 1999940061.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1600499991 - 2² = 1600499987 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1600499991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1600499911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 941731 + ... + 943428.

It is an arithmetic number, because the mean of its divisors is an integer number (267692720).

Almost surely, 2^1600499991 is an apocalyptic number.

1600499991 is a deficient number, since it is larger than the sum of its proper divisors (541041769).

1600499991 is a wasteful number, since it uses less digits than its factorization.

1600499991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1885445.

The product of its (nonzero) digits is 157464, while the sum is 48.

The square root of 1600499991 is about 40006.2493993126. The cubic root of 1600499991 is about 1169.7289144762.

The spelling of 1600499991 in words is "one billion, six hundred million, four hundred ninety-nine thousand, nine hundred ninety-one".