651976081 has 2 divisors, whose sum is σ = 651976082. Its totient is φ = 651976080.

The previous prime is 651976043. The next prime is 651976123. The reversal of 651976081 is 180679156.

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., 548262225 + 103713856 = 23415^2 + 10184^2 .

It is a cyclic number.

It is not a de Polignac number, because 651976081 - 2⁷ = 651975953 is a prime.

It is a super-2 number, since 2×651976081² = 850145620392237122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (651976681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325988040 + 325988041.

It is an arithmetic number, because the mean of its divisors is an integer number (325988041).

Almost surely, 2^651976081 is an apocalyptic number.

It is an amenable number.

651976081 is a deficient number, since it is larger than the sum of its proper divisors (1).

651976081 is an equidigital number, since it uses as much as digits as its factorization.

651976081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 651976081 is about 25533.8222951441. The cubic root of 651976081 is about 867.1160422169.

The spelling of 651976081 in words is "six hundred fifty-one million, nine hundred seventy-six thousand, eighty-one".