1655981291 has 2 divisors, whose sum is σ = 1655981292. Its totient is φ = 1655981290.

The previous prime is 1655981279. The next prime is 1655981293. The reversal of 1655981291 is 1921895561.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1655981291 is a prime.

It is a super-2 number, since 2×1655981291² = 5484548072284053362, which contains 22 as substring.

Together with 1655981293, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1655981293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 827990645 + 827990646.

It is an arithmetic number, because the mean of its divisors is an integer number (827990646).

Almost surely, 2^1655981291 is an apocalyptic number.

1655981291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1655981291 is an equidigital number, since it uses as much as digits as its factorization.

1655981291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 194400, while the sum is 47.

The square root of 1655981291 is about 40693.7500238059. The cubic root of 1655981291 is about 1183.0918844988.

The spelling of 1655981291 in words is "one billion, six hundred fifty-five million, nine hundred eighty-one thousand, two hundred ninety-one".