1694139919 has 2 divisors, whose sum is σ = 1694139920. Its totient is φ = 1694139918.

The previous prime is 1694139907. The next prime is 1694139949. The reversal of 1694139919 is 9199314961.

It is a weak prime.

It is an emirp because it is prime and its reverse (9199314961) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1694139919 - 2¹¹ = 1694137871 is a prime.

It is a super-2 number, since 2×1694139919² = 5740220130298653122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1694139949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 847069959 + 847069960.

It is an arithmetic number, because the mean of its divisors is an integer number (847069960).

Almost surely, 2^1694139919 is an apocalyptic number.

1694139919 is a deficient number, since it is larger than the sum of its proper divisors (1).

1694139919 is an equidigital number, since it uses as much as digits as its factorization.

1694139919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 472392, while the sum is 52.

The square root of 1694139919 is about 41159.9309887662. The cubic root of 1694139919 is about 1192.1102586232.

The spelling of 1694139919 in words is "one billion, six hundred ninety-four million, one hundred thirty-nine thousand, nine hundred nineteen".