1691187314 has 4 divisors (see below), whose sum is σ = 2536780974. Its totient is φ = 845593656.

The previous prime is 1691187307. The next prime is 1691187349. The reversal of 1691187314 is 4137811961.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1683707089 + 7480225 = 41033^2 + 2735^2 .

It is a super-2 number, since 2×1691187314² = 5720229062069069192, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422796827 + ... + 422796830.

Almost surely, 2^1691187314 is an apocalyptic number.

1691187314 is a deficient number, since it is larger than the sum of its proper divisors (845593660).

1691187314 is an equidigital number, since it uses as much as digits as its factorization.

1691187314 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 845593659.

The product of its digits is 36288, while the sum is 41.

The square root of 1691187314 is about 41124.0478795558. The cubic root of 1691187314 is about 1191.4173057213.

The spelling of 1691187314 in words is "one billion, six hundred ninety-one million, one hundred eighty-seven thousand, three hundred fourteen".