6845929891 has 2 divisors, whose sum is σ = 6845929892. Its totient is φ = 6845929890.

The previous prime is 6845929873. The next prime is 6845929943. The reversal of 6845929891 is 1989295486.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6845929891 - 2¹³ = 6845921699 is a prime.

It is not a weakly prime, because it can be changed into another prime (6845929841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3422964945 + 3422964946.

It is an arithmetic number, because the mean of its divisors is an integer number (3422964946).

Almost surely, 2^6845929891 is an apocalyptic number.

6845929891 is a deficient number, since it is larger than the sum of its proper divisors (1).

6845929891 is an equidigital number, since it uses as much as digits as its factorization.

6845929891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11197440, while the sum is 61.

The square root of 6845929891 is about 82740.1347049907. The cubic root of 6845929891 is about 1898.7923896881.

The spelling of 6845929891 in words is "six billion, eight hundred forty-five million, nine hundred twenty-nine thousand, eight hundred ninety-one".