651321523 has 2 divisors, whose sum is σ = 651321524. Its totient is φ = 651321522.

The previous prime is 651321509. The next prime is 651321529. The reversal of 651321523 is 325123156.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 651321523 - 2¹⁷ = 651190451 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 651321491 and 651321500.

It is not a weakly prime, because it can be changed into another prime (651321529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325660761 + 325660762.

It is an arithmetic number, because the mean of its divisors is an integer number (325660762).

Almost surely, 2^651321523 is an apocalyptic number.

651321523 is a deficient number, since it is larger than the sum of its proper divisors (1).

651321523 is an equidigital number, since it uses as much as digits as its factorization.

651321523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5400, while the sum is 28.

The square root of 651321523 is about 25521.0016065201. The cubic root of 651321523 is about 866.8257617364.

Adding to 651321523 its reverse (325123156), we get a palindrome (976444679).

The spelling of 651321523 in words is "six hundred fifty-one million, three hundred twenty-one thousand, five hundred twenty-three".