1691409122 has 18 divisors (see below), whose sum is σ = 2748517443. Its totient is φ = 780301392.

The previous prime is 1691409113. The next prime is 1691409131. The reversal of 1691409122 is 2219041961.

It is an interprime number because it is at equal distance from previous prime (1691409113) and next prime (1691409131).

It can be written as a sum of positive squares in 5 ways, for example, as 719902561 + 971506561 = 26831^2 + 31169^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=29081.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 754988 + ... + 757224.

Almost surely, 2^1691409122 is an apocalyptic number.

1691409122 is a deficient number, since it is larger than the sum of its proper divisors (1057108321).

1691409122 is an frugal number, since it uses more digits than its factorization.

1691409122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4502 (or 2252 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 1691409122 is about 41126.7446073720. The cubic root of 1691409122 is about 1191.4693903002.

The spelling of 1691409122 in words is "one billion, six hundred ninety-one million, four hundred nine thousand, one hundred twenty-two".