636545481 has 32 divisors (see below), whose sum is σ = 1003333632. Its totient is φ = 353885760.

The previous prime is 636545477. The next prime is 636545491. The reversal of 636545481 is 184545636.

It is not a de Polignac number, because 636545481 - 2² = 636545477 is a prime.

It is a super-2 number, since 2×636545481² = 810380298763042722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (636545411) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65376 + ... + 74478.

It is an arithmetic number, because the mean of its divisors is an integer number (31354176).

Almost surely, 2^636545481 is an apocalyptic number.

It is an amenable number.

636545481 is a deficient number, since it is larger than the sum of its proper divisors (366788151).

636545481 is a wasteful number, since it uses less digits than its factorization.

636545481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9293.

The product of its digits is 345600, while the sum is 42.

The square root of 636545481 is about 25229.8529722232. The cubic root of 636545481 is about 860.2205496181.

The spelling of 636545481 in words is "six hundred thirty-six million, five hundred forty-five thousand, four hundred eighty-one".