1691051 has 2 divisors, whose sum is σ = 1691052. Its totient is φ = 1691050.

The previous prime is 1691033. The next prime is 1691069. The reversal of 1691051 is 1501961.

It is a balanced prime because it is at equal distance from previous prime (1691033) and next prime (1691069).

It is an emirp because it is prime and its reverse (1501961) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1691051 - 2¹⁴ = 1674667 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1693051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 845525 + 845526.

It is an arithmetic number, because the mean of its divisors is an integer number (845526).

2^1691051 is an apocalyptic number.

1691051 is a deficient number, since it is larger than the sum of its proper divisors (1).

1691051 is an equidigital number, since it uses as much as digits as its factorization.

1691051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 270, while the sum is 23.

The square root of 1691051 is about 1300.4041679416. The cubic root of 1691051 is about 119.1385294439.

It can be divided in two parts, 16910 and 51, that added together give a palindrome (16961).

The spelling of 1691051 in words is "one million, six hundred ninety-one thousand, fifty-one".