6891291450 has 216 divisors, whose sum is σ = 19899172800. Its totient is φ = 1709069760.

The previous prime is 6891291419. The next prime is 6891291493. The reversal of 6891291450 is 541921986.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 6891291396 and 6891291405.

It is an unprimeable number.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 9584191 + ... + 9584909.

It is an arithmetic number, because the mean of its divisors is an integer number (92125800).

Almost surely, 2^6891291450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6891291450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9949586400).

6891291450 is an abundant number, since it is smaller than the sum of its proper divisors (13007881350).

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

6891291450 is a wasteful number, since it uses less digits than its factorization.

6891291450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834 (or 807 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 6891291450 is about 83013.8027679735. The cubic root of 6891291450 is about 1902.9769997424.

The spelling of 6891291450 in words is "six billion, eight hundred ninety-one million, two hundred ninety-one thousand, four hundred fifty".