1581079 has 2 divisors, whose sum is σ = 1581080. Its totient is φ = 1581078.

The previous prime is 1581077. The next prime is 1581091. The reversal of 1581079 is 9701851.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1581079 - 2¹ = 1581077 is a prime.

Together with 1581077, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1581079.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1581071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 790539 + 790540.

It is an arithmetic number, because the mean of its divisors is an integer number (790540).

2^1581079 is an apocalyptic number.

1581079 is a deficient number, since it is larger than the sum of its proper divisors (1).

1581079 is an equidigital number, since it uses as much as digits as its factorization.

1581079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 31.

The square root of 1581079 is about 1257.4096389005. The cubic root of 1581079 is about 116.4978356171.

It can be divided in two parts, 15810 and 79, that multiplied together give a triangular number (1248990 = T₁₅₈₀).

The spelling of 1581079 in words is "one million, five hundred eighty-one thousand, seventy-nine".