8451694491 has 16 divisors (see below), whose sum is σ = 11309205024. Its totient is φ = 5614354944.

The previous prime is 8451694453. The next prime is 8451694519. The reversal of 8451694491 is 1944961548.

It is a de Polignac number, because none of the positive numbers 2^k-8451694491 is a prime.

It is a super-2 number, since 2×8451694491² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8451694421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1327171 + ... + 1333523.

It is an arithmetic number, because the mean of its divisors is an integer number (706825314).

Almost surely, 2^8451694491 is an apocalyptic number.

8451694491 is a deficient number, since it is larger than the sum of its proper divisors (2857510533).

8451694491 is a wasteful number, since it uses less digits than its factorization.

8451694491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7870.

The product of its digits is 1244160, while the sum is 51.

The square root of 8451694491 is about 91933.0979082071. The cubic root of 8451694491 is about 2036.9541958612.

The spelling of 8451694491 in words is "eight billion, four hundred fifty-one million, six hundred ninety-four thousand, four hundred ninety-one".