1691971048 has 16 divisors (see below), whose sum is σ = 3239945280. Its totient is φ = 827985648.

The previous prime is 1691971031. The next prime is 1691971069. The reversal of 1691971048 is 8401791961.

It is a junction number, because it is equal to n+sod(n) for n = 1691970989 and 1691971007.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2249586 + ... + 2250337.

It is an arithmetic number, because the mean of its divisors is an integer number (202496580).

Almost surely, 2^1691971048 is an apocalyptic number.

It is an amenable number.

1691971048 is a deficient number, since it is larger than the sum of its proper divisors (1547974232).

1691971048 is a wasteful number, since it uses less digits than its factorization.

1691971048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4499976 (or 4499972 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 46.

The square root of 1691971048 is about 41133.5756772980. The cubic root of 1691971048 is about 1191.6013204348.

The spelling of 1691971048 in words is "one billion, six hundred ninety-one million, nine hundred seventy-one thousand, forty-eight".