651240647 has 2 divisors, whose sum is σ = 651240648. Its totient is φ = 651240646.

The previous prime is 651240593. The next prime is 651240671. The reversal of 651240647 is 746042156.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 651240647 - 2²⁰ = 650192071 is a prime.

It is a super-2 number, since 2×651240647² = 848228760609957218, 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 (651240347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325620323 + 325620324.

It is an arithmetic number, because the mean of its divisors is an integer number (325620324).

Almost surely, 2^651240647 is an apocalyptic number.

651240647 is a deficient number, since it is larger than the sum of its proper divisors (1).

651240647 is an equidigital number, since it uses as much as digits as its factorization.

651240647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 651240647 is about 25519.4170583891. The cubic root of 651240647 is about 866.7898817090.

The spelling of 651240647 in words is "six hundred fifty-one million, two hundred forty thousand, six hundred forty-seven".