1691712042 has 16 divisors (see below), whose sum is σ = 3500094240. Its totient is φ = 544458992.

The previous prime is 1691712037. The next prime is 1691712049. The reversal of 1691712042 is 2402171961.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1691711994 and 1691712012.

It is not an unprimeable number, because it can be changed into a prime (1691712049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4861068 + ... + 4861415.

It is an arithmetic number, because the mean of its divisors is an integer number (218755890).

Almost surely, 2^1691712042 is an apocalyptic number.

1691712042 is an abundant number, since it is smaller than the sum of its proper divisors (1808382198).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1691712042 is a wasteful number, since it uses less digits than its factorization.

1691712042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9722517.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 1691712042 is about 41130.4272042001. The cubic root of 1691712042 is about 1191.5405141064.

The spelling of 1691712042 in words is "one billion, six hundred ninety-one million, seven hundred twelve thousand, forty-two".