651540671 has 8 divisors (see below), whose sum is σ = 672866304. Its totient is φ = 630234360.

The previous prime is 651540653. The next prime is 651540679. The reversal of 651540671 is 176045156.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 651540671 - 2¹⁴ = 651524287 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 (651540679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100490 + ... + 106776.

It is an arithmetic number, because the mean of its divisors is an integer number (84108288).

Almost surely, 2^651540671 is an apocalyptic number.

651540671 is a deficient number, since it is larger than the sum of its proper divisors (21325633).

651540671 is a wasteful number, since it uses less digits than its factorization.

651540671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9661.

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 651540671 is about 25525.2947289546. The cubic root of 651540671 is about 866.9229701677.

The spelling of 651540671 in words is "six hundred fifty-one million, five hundred forty thousand, six hundred seventy-one".