653231591 has 2 divisors, whose sum is σ = 653231592. Its totient is φ = 653231590.

The previous prime is 653231581. The next prime is 653231669. The reversal of 653231591 is 195132356.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 653231591 - 2¹⁴ = 653215207 is a prime.

It is a super-2 number, since 2×653231591² = 853423022960782562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (653231531) 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, 326615795 + 326615796.

It is an arithmetic number, because the mean of its divisors is an integer number (326615796).

Almost surely, 2^653231591 is an apocalyptic number.

653231591 is a deficient number, since it is larger than the sum of its proper divisors (1).

653231591 is an equidigital number, since it uses as much as digits as its factorization.

653231591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24300, while the sum is 35.

The square root of 653231591 is about 25558.3957047386. The cubic root of 653231591 is about 867.6722869533.

The spelling of 653231591 in words is "six hundred fifty-three million, two hundred thirty-one thousand, five hundred ninety-one".