650021651 has 2 divisors, whose sum is σ = 650021652. Its totient is φ = 650021650.

The previous prime is 650021633. The next prime is 650021657. The reversal of 650021651 is 156120056.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-650021651 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 650021651.

It is not a weakly prime, because it can be changed into another prime (650021657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325010825 + 325010826.

It is an arithmetic number, because the mean of its divisors is an integer number (325010826).

Almost surely, 2^650021651 is an apocalyptic number.

650021651 is a deficient number, since it is larger than the sum of its proper divisors (1).

650021651 is an equidigital number, since it uses as much as digits as its factorization.

650021651 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 26.

The square root of 650021651 is about 25495.5221754723. The cubic root of 650021651 is about 866.2487231535.

The spelling of 650021651 in words is "six hundred fifty million, twenty-one thousand, six hundred fifty-one".