645236271 has 12 divisors (see below), whose sum is σ = 932485320. Its totient is φ = 429937200.

The previous prime is 645236239. The next prime is 645236287. The reversal of 645236271 is 172632546.

645236271 is a `hidden beast` number, since 6 + 4 + 5 + 23 + 627 + 1 = 666.

It is not a de Polignac number, because 645236271 - 2⁵ = 645236239 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645236231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1296 + ... + 35946.

It is an arithmetic number, because the mean of its divisors is an integer number (77707110).

Almost surely, 2^645236271 is an apocalyptic number.

645236271 is a deficient number, since it is larger than the sum of its proper divisors (287249049).

645236271 is a wasteful number, since it uses less digits than its factorization.

645236271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36726 (or 36723 counting only the distinct ones).

The product of its digits is 60480, while the sum is 36.

The square root of 645236271 is about 25401.5013532665. The cubic root of 645236271 is about 864.1177461377.

The spelling of 645236271 in words is "six hundred forty-five million, two hundred thirty-six thousand, two hundred seventy-one".