1591680906 has 12 divisors (see below), whose sum is σ = 3448642002. Its totient is φ = 530560296.

The previous prime is 1591680899. The next prime is 1591680907. The reversal of 1591680906 is 6090861951.

It can be written as a sum of positive squares in only one way, i.e., 1128355281 + 463325625 = 33591^2 + 21525^2 .

It is not an unprimeable number, because it can be changed into a prime (1591680907) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 44213341 + ... + 44213376.

Almost surely, 2^1591680906 is an apocalyptic number.

1591680906 is an abundant number, since it is smaller than the sum of its proper divisors (1856961096).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1591680906 is a wasteful number, since it uses less digits than its factorization.

1591680906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88426725 (or 88426722 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The square root of 1591680906 is about 39895.8758018921. The cubic root of 1591680906 is about 1167.5764736454.

The spelling of 1591680906 in words is "one billion, five hundred ninety-one million, six hundred eighty thousand, nine hundred six".