651867841 has 2 divisors, whose sum is σ = 651867842. Its totient is φ = 651867840.

The previous prime is 651867823. The next prime is 651867847. The reversal of 651867841 is 148768156.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 567154225 + 84713616 = 23815^2 + 9204^2 .

It is a cyclic number.

It is not a de Polignac number, because 651867841 - 2²⁷ = 517650113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 651867791 and 651867800.

It is not a weakly prime, because it can be changed into another prime (651867847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325933920 + 325933921.

It is an arithmetic number, because the mean of its divisors is an integer number (325933921).

Almost surely, 2^651867841 is an apocalyptic number.

It is an amenable number.

651867841 is a deficient number, since it is larger than the sum of its proper divisors (1).

651867841 is an equidigital number, since it uses as much as digits as its factorization.

651867841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 322560, while the sum is 46.

The square root of 651867841 is about 25531.7026655098. The cubic root of 651867841 is about 867.0680538333.

The spelling of 651867841 in words is "six hundred fifty-one million, eight hundred sixty-seven thousand, eight hundred forty-one".