651256221 has 32 divisors (see below), whose sum is σ = 1084640256. Its totient is φ = 337680000.

The previous prime is 651256211. The next prime is 651256241. The reversal of 651256221 is 122652156.

651256221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 651256221 - 2⁵ = 651256189 is a prime.

It is a super-3 number, since 3×651256221³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651256211) 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, 136486 + ... + 141176.

It is an arithmetic number, because the mean of its divisors is an integer number (33895008).

Almost surely, 2^651256221 is an apocalyptic number.

It is an amenable number.

651256221 is a deficient number, since it is larger than the sum of its proper divisors (433384035).

651256221 is a wasteful number, since it uses less digits than its factorization.

651256221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5313.

The product of its digits is 7200, while the sum is 30.

The square root of 651256221 is about 25519.7221967638. The cubic root of 651256221 is about 866.7967912276.

The spelling of 651256221 in words is "six hundred fifty-one million, two hundred fifty-six thousand, two hundred twenty-one".