648429251 has 2 divisors, whose sum is σ = 648429252. Its totient is φ = 648429250.

The previous prime is 648429239. The next prime is 648429253. The reversal of 648429251 is 152924846.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 648429251 - 2¹⁰ = 648428227 is a prime.

Together with 648429253, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 648429199 and 648429208.

It is not a weakly prime, because it can be changed into another prime (648429253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324214625 + 324214626.

It is an arithmetic number, because the mean of its divisors is an integer number (324214626).

Almost surely, 2^648429251 is an apocalyptic number.

648429251 is a deficient number, since it is larger than the sum of its proper divisors (1).

648429251 is an equidigital number, since it uses as much as digits as its factorization.

648429251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 138240, while the sum is 41.

The square root of 648429251 is about 25464.2740128204. The cubic root of 648429251 is about 865.5407762650.

The spelling of 648429251 in words is "six hundred forty-eight million, four hundred twenty-nine thousand, two hundred fifty-one".