1321579 has 8 divisors (see below), whose sum is σ = 1541600. Its totient is φ = 1132488.

The previous prime is 1321577. The next prime is 1321589. The reversal of 1321579 is 9751231.

It is not a de Polignac number, because 1321579 - 2¹ = 1321577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321571) 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, 1584 + ... + 2269.

It is an arithmetic number, because the mean of its divisors is an integer number (192700).

2^1321579 is an apocalyptic number.

1321579 is a deficient number, since it is larger than the sum of its proper divisors (220021).

1321579 is an frugal number, since it uses more digits than its factorization.

1321579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3874 (or 3860 counting only the distinct ones).

The product of its digits is 1890, while the sum is 28.

The square root of 1321579 is about 1149.5994954766. The cubic root of 1321579 is about 109.7398535667.

It can be divided in two parts, 132 and 1579, that added together give a triangular number (1711 = T₅₈).

The spelling of 1321579 in words is "one million, three hundred twenty-one thousand, five hundred seventy-nine".