1321955 has 4 divisors (see below), whose sum is σ = 1586352. Its totient is φ = 1057560.

The previous prime is 1321951. The next prime is 1321961. The reversal of 1321955 is 5591231.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1321955 - 2² = 1321951 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132191 + ... + 132200.

It is an arithmetic number, because the mean of its divisors is an integer number (396588).

2^1321955 is an apocalyptic number.

1321955 is a deficient number, since it is larger than the sum of its proper divisors (264397).

1321955 is an equidigital number, since it uses as much as digits as its factorization.

1321955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264396.

The product of its digits is 1350, while the sum is 26.

The square root of 1321955 is about 1149.7630190609. The cubic root of 1321955 is about 109.7502598742.

The spelling of 1321955 in words is "one million, three hundred twenty-one thousand, nine hundred fifty-five".