651440271 has 4 divisors (see below), whose sum is σ = 868587032. Its totient is φ = 434293512.

The previous prime is 651440269. The next prime is 651440303. The reversal of 651440271 is 172044156.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 651440271 - 2¹ = 651440269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651440371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108573376 + ... + 108573381.

It is an arithmetic number, because the mean of its divisors is an integer number (217146758).

Almost surely, 2^651440271 is an apocalyptic number.

651440271 is a deficient number, since it is larger than the sum of its proper divisors (217146761).

651440271 is a wasteful number, since it uses less digits than its factorization.

651440271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217146760.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 651440271 is about 25523.3279765786. The cubic root of 651440271 is about 866.8784380092.

The spelling of 651440271 in words is "six hundred fifty-one million, four hundred forty thousand, two hundred seventy-one".