651557497 has 2 divisors, whose sum is σ = 651557498. Its totient is φ = 651557496.

The previous prime is 651557483. The next prime is 651557509. The reversal of 651557497 is 794755156.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 391090176 + 260467321 = 19776^2 + 16139^2 .

It is a cyclic number.

It is not a de Polignac number, because 651557497 - 2¹¹ = 651555449 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 651557497.

It is not a weakly prime, because it can be changed into another prime (651557407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325778748 + 325778749.

It is an arithmetic number, because the mean of its divisors is an integer number (325778749).

Almost surely, 2^651557497 is an apocalyptic number.

It is an amenable number.

651557497 is a deficient number, since it is larger than the sum of its proper divisors (1).

651557497 is an equidigital number, since it uses as much as digits as its factorization.

651557497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1323000, while the sum is 49.

The square root of 651557497 is about 25525.6243214539. The cubic root of 651557497 is about 866.9304328486.

The spelling of 651557497 in words is "six hundred fifty-one million, five hundred fifty-seven thousand, four hundred ninety-seven".