1691422138 has 16 divisors (see below), whose sum is σ = 2901423744. Its totient is φ = 724434480.

The previous prime is 1691422099. The next prime is 1691422151. The reversal of 1691422138 is 8312241961.

It is a junction number, because it is equal to n+sod(n) for n = 1691422097 and 1691422106.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15093 + ... + 60088.

It is an arithmetic number, because the mean of its divisors is an integer number (181338984).

Almost surely, 2^1691422138 is an apocalyptic number.

1691422138 is a deficient number, since it is larger than the sum of its proper divisors (1210001606).

1691422138 is a wasteful number, since it uses less digits than its factorization.

1691422138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76797.

The product of its digits is 20736, while the sum is 37.

The square root of 1691422138 is about 41126.9028495947. The cubic root of 1691422138 is about 1191.4724465538.

The spelling of 1691422138 in words is "one billion, six hundred ninety-one million, four hundred twenty-two thousand, one hundred thirty-eight".