6131891691 has 12 divisors (see below), whose sum is σ = 8860915440. Its totient is φ = 4086202320.

The previous prime is 6131891681. The next prime is 6131891713. The reversal of 6131891691 is 1961981316.

6131891691 is a `hidden beast` number, since 613 + 18 + 9 + 16 + 9 + 1 = 666.

It is not a de Polignac number, because 6131891691 - 2⁶ = 6131891627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6131891611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 121095 + ... + 164096.

It is an arithmetic number, because the mean of its divisors is an integer number (738409620).

Almost surely, 2^6131891691 is an apocalyptic number.

6131891691 is a deficient number, since it is larger than the sum of its proper divisors (2729023749).

6131891691 is a wasteful number, since it uses less digits than its factorization.

6131891691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287586 (or 287583 counting only the distinct ones).

The product of its digits is 69984, while the sum is 45.

The square root of 6131891691 is about 78306.3962330026. The cubic root of 6131891691 is about 1830.3388237631.

The spelling of 6131891691 in words is "six billion, one hundred thirty-one million, eight hundred ninety-one thousand, six hundred ninety-one".