1691131206 has 16 divisors (see below), whose sum is σ = 3385986048. Its totient is φ = 563089800.

The previous prime is 1691131193. The next prime is 1691131217. The reversal of 1691131206 is 6021311961.

It is a Curzon number.

It is a congruent number.

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, 149230 + ... + 160161.

It is an arithmetic number, because the mean of its divisors is an integer number (211624128).

Almost surely, 2^1691131206 is an apocalyptic number.

1691131206 is an abundant number, since it is smaller than the sum of its proper divisors (1694854842).

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

1691131206 is a wasteful number, since it uses less digits than its factorization.

1691131206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310307.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 1691131206 is about 41123.3656939701. The cubic root of 1691131206 is about 1191.4041298141.

The spelling of 1691131206 in words is "one billion, six hundred ninety-one million, one hundred thirty-one thousand, two hundred six".