1691204023 has 2 divisors, whose sum is σ = 1691204024. Its totient is φ = 1691204022.

The previous prime is 1691203999. The next prime is 1691204027. The reversal of 1691204023 is 3204021961.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1691204023 - 2¹⁷ = 1691072951 is a prime.

It is a super-2 number, since 2×1691204023² = 5720342094822769058, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1691203982 and 1691204000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1691204027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 845602011 + 845602012.

It is an arithmetic number, because the mean of its divisors is an integer number (845602012).

Almost surely, 2^1691204023 is an apocalyptic number.

1691204023 is a deficient number, since it is larger than the sum of its proper divisors (1).

1691204023 is an equidigital number, since it uses as much as digits as its factorization.

1691204023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 1691204023 is about 41124.2510326936. The cubic root of 1691204023 is about 1191.4212294590.

Adding to 1691204023 its reverse (3204021961), we get a palindrome (4895225984).

The spelling of 1691204023 in words is "one billion, six hundred ninety-one million, two hundred four thousand, twenty-three".