651360991 has 2 divisors, whose sum is σ = 651360992. Its totient is φ = 651360990.

The previous prime is 651360977. The next prime is 651361013. The reversal of 651360991 is 199063156.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 651360991 - 2⁷ = 651360863 is a prime.

It is a super-2 number, since 2×651360991² = 848542281193004162, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (651360961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325680495 + 325680496.

It is an arithmetic number, because the mean of its divisors is an integer number (325680496).

Almost surely, 2^651360991 is an apocalyptic number.

651360991 is a deficient number, since it is larger than the sum of its proper divisors (1).

651360991 is an equidigital number, since it uses as much as digits as its factorization.

651360991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43740, while the sum is 40.

The square root of 651360991 is about 25521.7748403202. The cubic root of 651360991 is about 866.8432703385.

The spelling of 651360991 in words is "six hundred fifty-one million, three hundred sixty thousand, nine hundred ninety-one".