1331697 has 4 divisors (see below), whose sum is σ = 1775600. Its totient is φ = 887796.

The previous prime is 1331683. The next prime is 1331699. The reversal of 1331697 is 7961331.

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 not a de Polignac number, because 1331697 - 2⁶ = 1331633 is a prime.

It is a D-number.

It is a Duffinian number.

1331697 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1331699) 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, 221947 + ... + 221952.

It is an arithmetic number, because the mean of its divisors is an integer number (443900).

2^1331697 is an apocalyptic number.

It is an amenable number.

1331697 is a deficient number, since it is larger than the sum of its proper divisors (443903).

1331697 is an equidigital number, since it uses as much as digits as its factorization.

1331697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443902.

The product of its digits is 3402, while the sum is 30.

The square root of 1331697 is about 1153.9917677349. The cubic root of 1331697 is about 110.0191977512.

It can be divided in two parts, 133 and 1697, that added together give a triangular number (1830 = T₆₀).

The spelling of 1331697 in words is "one million, three hundred thirty-one thousand, six hundred ninety-seven".