651620129 has 2 divisors, whose sum is σ = 651620130. Its totient is φ = 651620128.

The previous prime is 651620089. The next prime is 651620191. The reversal of 651620129 is 921026156.

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., 611424529 + 40195600 = 24727^2 + 6340^2 .

It is a cyclic number.

It is not a de Polignac number, because 651620129 - 2¹² = 651616033 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 651620095 and 651620104.

It is not a weakly prime, because it can be changed into another prime (651620329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325810064 + 325810065.

It is an arithmetic number, because the mean of its divisors is an integer number (325810065).

Almost surely, 2^651620129 is an apocalyptic number.

It is an amenable number.

651620129 is a deficient number, since it is larger than the sum of its proper divisors (1).

651620129 is an equidigital number, since it uses as much as digits as its factorization.

651620129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 651620129 is about 25526.8511375767. The cubic root of 651620129 is about 866.9582103138.

The spelling of 651620129 in words is "six hundred fifty-one million, six hundred twenty thousand, one hundred twenty-nine".