651725197 has 2 divisors, whose sum is σ = 651725198. Its totient is φ = 651725196.

The previous prime is 651725167. The next prime is 651725201. The reversal of 651725197 is 791527156.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 543169636 + 108555561 = 23306^2 + 10419^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-651725197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (651725167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325862598 + 325862599.

It is an arithmetic number, because the mean of its divisors is an integer number (325862599).

Almost surely, 2^651725197 is an apocalyptic number.

It is an amenable number.

651725197 is a deficient number, since it is larger than the sum of its proper divisors (1).

651725197 is an equidigital number, since it uses as much as digits as its factorization.

651725197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 132300, while the sum is 43.

The square root of 651725197 is about 25528.9090444539. The cubic root of 651725197 is about 867.0048042652.

The spelling of 651725197 in words is "six hundred fifty-one million, seven hundred twenty-five thousand, one hundred ninety-seven".