1991266708 has 6 divisors (see below), whose sum is σ = 3484716746. Its totient is φ = 995633352.

The previous prime is 1991266649. The next prime is 1991266723. The reversal of 1991266708 is 8076621991.

It can be written as a sum of positive squares in only one way, i.e., 1314642564 + 676624144 = 36258^2 + 26012^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 248908335 + ... + 248908342.

Almost surely, 2^1991266708 is an apocalyptic number.

It is an amenable number.

1991266708 is a deficient number, since it is larger than the sum of its proper divisors (1493450038).

1991266708 is a wasteful number, since it uses less digits than its factorization.

1991266708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497816681 (or 497816679 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 49.

The square root of 1991266708 is about 44623.6115526298. The cubic root of 1991266708 is about 1258.0844976998.

The spelling of 1991266708 in words is "one billion, nine hundred ninety-one million, two hundred sixty-six thousand, seven hundred eight".