651206551 has 4 divisors (see below), whose sum is σ = 685480600. Its totient is φ = 616932504.

The previous prime is 651206531. The next prime is 651206561. The reversal of 651206551 is 155602156.

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

It is a cyclic number.

It is not a de Polignac number, because 651206551 - 2⁵ = 651206519 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 (651206531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17136996 + ... + 17137033.

It is an arithmetic number, because the mean of its divisors is an integer number (171370150).

Almost surely, 2^651206551 is an apocalyptic number.

651206551 is a deficient number, since it is larger than the sum of its proper divisors (34274049).

651206551 is a wasteful number, since it uses less digits than its factorization.

651206551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34274048.

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 651206551 is about 25518.7490093069. The cubic root of 651206551 is about 866.7747543856.

The spelling of 651206551 in words is "six hundred fifty-one million, two hundred six thousand, five hundred fifty-one".