1691045 has 16 divisors (see below), whose sum is σ = 2125872. Its totient is φ = 1290240.

The previous prime is 1691033. The next prime is 1691051. The reversal of 1691045 is 5401961.

It can be written as a sum of positive squares in 8 ways, for example, as 611524 + 1079521 = 782^2 + 1039^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1691045 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14909 + ... + 15021.

It is an arithmetic number, because the mean of its divisors is an integer number (132867).

2^1691045 is an apocalyptic number.

It is an amenable number.

1691045 is a deficient number, since it is larger than the sum of its proper divisors (434827).

1691045 is a wasteful number, since it uses less digits than its factorization.

1691045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 1691045 is about 1300.4018609645. The cubic root of 1691045 is about 119.1383885390.

The spelling of 1691045 in words is "one million, six hundred ninety-one thousand, forty-five".