1591113849 has 64 divisors (see below), whose sum is σ = 2471067648. Its totient is φ = 902880000.

The previous prime is 1591113847. The next prime is 1591113869. The reversal of 1591113849 is 9483111951.

It is a happy number.

It is not a de Polignac number, because 1591113849 - 2¹ = 1591113847 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1591113849.

It is not an unprimeable number, because it can be changed into a prime (1591113847) 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 63 ways as a sum of consecutive naturals, for example, 6338974 + ... + 6339224.

It is an arithmetic number, because the mean of its divisors is an integer number (38610432).

Almost surely, 2^1591113849 is an apocalyptic number.

It is an amenable number.

1591113849 is a deficient number, since it is larger than the sum of its proper divisors (879953799).

1591113849 is a wasteful number, since it uses less digits than its factorization.

1591113849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518.

The product of its digits is 38880, while the sum is 42.

The square root of 1591113849 is about 39888.7684567975. The cubic root of 1591113849 is about 1167.4378024142.

It can be divided in two parts, 1591 and 113849, that added together give a triangular number (115440 = T₄₈₀).

The spelling of 1591113849 in words is "one billion, five hundred ninety-one million, one hundred thirteen thousand, eight hundred forty-nine".