1318621 has 4 divisors (see below), whose sum is σ = 1334592. Its totient is φ = 1302652.

The previous prime is 1318609. The next prime is 1318633. The reversal of 1318621 is 1268131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1318609) and next prime (1318633).

It is a cyclic number.

It is not a de Polignac number, because 1318621 - 2¹⁵ = 1285853 is a prime.

It is a super-2 number, since 2×1318621² = 3477522683282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1318592 and 1318601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1318661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7861 + ... + 8026.

It is an arithmetic number, because the mean of its divisors is an integer number (333648).

2^1318621 is an apocalyptic number.

It is an amenable number.

1318621 is a deficient number, since it is larger than the sum of its proper divisors (15971).

1318621 is an equidigital number, since it uses as much as digits as its factorization.

1318621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15970.

The product of its digits is 288, while the sum is 22.

The square root of 1318621 is about 1148.3122397676. The cubic root of 1318621 is about 109.6579180000.

The spelling of 1318621 in words is "one million, three hundred eighteen thousand, six hundred twenty-one".