1690901 has 2 divisors, whose sum is σ = 1690902. Its totient is φ = 1690900.

The previous prime is 1690883. The next prime is 1690933. The reversal of 1690901 is 1090961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1002001 + 688900 = 1001^2 + 830^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1690901 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is equal to p₁₂₇₄₉₃ and since 1690901 and 127493 have the same sum of digits, it is a Honaker prime.

It is a nialpdrome in base 11.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1600901) 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 as a sum of consecutive naturals, namely, 845450 + 845451.

It is an arithmetic number, because the mean of its divisors is an integer number (845451).

2^1690901 is an apocalyptic number.

It is an amenable number.

1690901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1690901 is an equidigital number, since it uses as much as digits as its factorization.

1690901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 26.

The square root of 1690901 is about 1300.3464922858. The cubic root of 1690901 is about 119.1350067219.

The spelling of 1690901 in words is "one million, six hundred ninety thousand, nine hundred one".