1691493143 has 2 divisors, whose sum is σ = 1691493144. Its totient is φ = 1691493142.

The previous prime is 1691493131. The next prime is 1691493173. The reversal of 1691493143 is 3413941961.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1691493143 - 2⁶ = 1691493079 is a prime.

It is a super-2 number, since 2×1691493143² = 5722298105632036898, which contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1691493143.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1691493173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 845746571 + 845746572.

It is an arithmetic number, because the mean of its divisors is an integer number (845746572).

Almost surely, 2^1691493143 is an apocalyptic number.

1691493143 is a deficient number, since it is larger than the sum of its proper divisors (1).

1691493143 is an equidigital number, since it uses as much as digits as its factorization.

1691493143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 41.

The square root of 1691493143 is about 41127.7660832679. The cubic root of 1691493143 is about 1191.4891187800.

The spelling of 1691493143 in words is "one billion, six hundred ninety-one million, four hundred ninety-three thousand, one hundred forty-three".