1691941231 has 2 divisors, whose sum is σ = 1691941232. Its totient is φ = 1691941230.

The previous prime is 1691941169. The next prime is 1691941261. The reversal of 1691941231 is 1321491961.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1691941231 - 2⁷ = 1691941103 is a prime.

It is a super-2 number, since 2×1691941231² = 5725330258315590722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1691941261) 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, 845970615 + 845970616.

It is an arithmetic number, because the mean of its divisors is an integer number (845970616).

Almost surely, 2^1691941231 is an apocalyptic number.

1691941231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1691941231 is an equidigital number, since it uses as much as digits as its factorization.

1691941231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664, while the sum is 37.

The square root of 1691941231 is about 41133.2132345627. The cubic root of 1691941231 is about 1191.5943206725.

The spelling of 1691941231 in words is "one billion, six hundred ninety-one million, nine hundred forty-one thousand, two hundred thirty-one".