655941491 has 2 divisors, whose sum is σ = 655941492. Its totient is φ = 655941490.

The previous prime is 655941467. The next prime is 655941547. The reversal of 655941491 is 194149556.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-655941491 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (651941491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327970745 + 327970746.

It is an arithmetic number, because the mean of its divisors is an integer number (327970746).

Almost surely, 2^655941491 is an apocalyptic number.

655941491 is a deficient number, since it is larger than the sum of its proper divisors (1).

655941491 is an equidigital number, since it uses as much as digits as its factorization.

655941491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 194400, while the sum is 44.

The square root of 655941491 is about 25611.3547279327. The cubic root of 655941491 is about 868.8704639398.

The spelling of 655941491 in words is "six hundred fifty-five million, nine hundred forty-one thousand, four hundred ninety-one".