655503491 has 2 divisors, whose sum is σ = 655503492. Its totient is φ = 655503490.

The previous prime is 655503451. The next prime is 655503503. The reversal of 655503491 is 194305556.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 655503491 - 2²⁶ = 588394627 is a prime.

It is not a weakly prime, because it can be changed into another prime (655503451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327751745 + 327751746.

It is an arithmetic number, because the mean of its divisors is an integer number (327751746).

Almost surely, 2^655503491 is an apocalyptic number.

655503491 is a deficient number, since it is larger than the sum of its proper divisors (1).

655503491 is an equidigital number, since it uses as much as digits as its factorization.

655503491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81000, while the sum is 38.

The square root of 655503491 is about 25602.8024052056. The cubic root of 655503491 is about 868.6770269710.

The spelling of 655503491 in words is "six hundred fifty-five million, five hundred three thousand, four hundred ninety-one".