1591212099 has 16 divisors (see below), whose sum is σ = 2146616352. Its totient is φ = 1048363008.

The previous prime is 1591212097. The next prime is 1591212101. The reversal of 1591212099 is 9902121951.

It is a Cunningham number, because it is equal to 39890²-1.

It is an interprime number because it is at equal distance from previous prime (1591212097) and next prime (1591212101).

It is not a de Polignac number, because 1591212099 - 2¹ = 1591212097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1591212097) 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, 113019 + ... + 126315.

It is an arithmetic number, because the mean of its divisors is an integer number (134163522).

Almost surely, 2^1591212099 is an apocalyptic number.

1591212099 is a deficient number, since it is larger than the sum of its proper divisors (555404253).

1591212099 is a wasteful number, since it uses less digits than its factorization.

1591212099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13766.

The product of its (nonzero) digits is 14580, while the sum is 39.

The square root of 1591212099 is about 39889.9999874655. Note that the first 4 decimals coincide. The cubic root of 1591212099 is about 1167.4618313679.

The spelling of 1591212099 in words is "one billion, five hundred ninety-one million, two hundred twelve thousand, ninety-nine".