651352021 has 2 divisors, whose sum is σ = 651352022. Its totient is φ = 651352020.

The previous prime is 651352007. The next prime is 651352049. The reversal of 651352021 is 120253156.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 521619921 + 129732100 = 22839^2 + 11390^2 .

It is a cyclic number.

It is not a de Polignac number, because 651352021 - 2⁵ = 651351989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (651352081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325676010 + 325676011.

It is an arithmetic number, because the mean of its divisors is an integer number (325676011).

Almost surely, 2^651352021 is an apocalyptic number.

It is an amenable number.

651352021 is a deficient number, since it is larger than the sum of its proper divisors (1).

651352021 is an equidigital number, since it uses as much as digits as its factorization.

651352021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 651352021 is about 25521.5991074227. The cubic root of 651352021 is about 866.8392911728.

The spelling of 651352021 in words is "six hundred fifty-one million, three hundred fifty-two thousand, twenty-one".