651793861 has 2 divisors, whose sum is σ = 651793862. Its totient is φ = 651793860.

The previous prime is 651793853. The next prime is 651793897. The reversal of 651793861 is 168397156.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 598780900 + 53012961 = 24470^2 + 7281^2 .

It is a cyclic number.

It is not a de Polignac number, because 651793861 - 2³ = 651793853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (651793811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325896930 + 325896931.

It is an arithmetic number, because the mean of its divisors is an integer number (325896931).

Almost surely, 2^651793861 is an apocalyptic number.

It is an amenable number.

651793861 is a deficient number, since it is larger than the sum of its proper divisors (1).

651793861 is an equidigital number, since it uses as much as digits as its factorization.

651793861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 46.

The square root of 651793861 is about 25530.2538373593. The cubic root of 651793861 is about 867.0352516212.

The spelling of 651793861 in words is "six hundred fifty-one million, seven hundred ninety-three thousand, eight hundred sixty-one".