4491157851 has 48 divisors (see below), whose sum is σ = 6907680000. Its totient is φ = 2803913280.

The previous prime is 4491157849. The next prime is 4491157873. The reversal of 4491157851 is 1587511944.

4491157851 is a `hidden beast` number, since 4 + 491 + 157 + 8 + 5 + 1 = 666.

It is not a de Polignac number, because 4491157851 - 2¹ = 4491157849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4491157797 and 4491157806.

It is not an unprimeable number, because it can be changed into a prime (4491157351) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9146716 + ... + 9147206.

It is an arithmetic number, because the mean of its divisors is an integer number (143910000).

Almost surely, 2^4491157851 is an apocalyptic number.

4491157851 is a deficient number, since it is larger than the sum of its proper divisors (2416522149).

4491157851 is a wasteful number, since it uses less digits than its factorization.

4491157851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024 (or 1021 counting only the distinct ones).

The product of its digits is 201600, while the sum is 45.

The square root of 4491157851 is about 67016.1014309248. The cubic root of 4491157851 is about 1649.8815771758.

The spelling of 4491157851 in words is "four billion, four hundred ninety-one million, one hundred fifty-seven thousand, eight hundred fifty-one".