1591012279 has 2 divisors, whose sum is σ = 1591012280. Its totient is φ = 1591012278.

The previous prime is 1591012277. The next prime is 1591012331. The reversal of 1591012279 is 9722101951.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1591012279 - 2¹ = 1591012277 is a prime.

It is a super-3 number, since 3×1591012279³ (a number of 29 digits) contains 333 as substring.

Together with 1591012277, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1591012271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 795506139 + 795506140.

It is an arithmetic number, because the mean of its divisors is an integer number (795506140).

Almost surely, 2^1591012279 is an apocalyptic number.

1591012279 is a deficient number, since it is larger than the sum of its proper divisors (1).

1591012279 is an equidigital number, since it uses as much as digits as its factorization.

1591012279 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11340, while the sum is 37.

The square root of 1591012279 is about 39887.4952710746. The cubic root of 1591012279 is about 1167.4129604498.

The spelling of 1591012279 in words is "one billion, five hundred ninety-one million, twelve thousand, two hundred seventy-nine".