1655812231 has 2 divisors, whose sum is σ = 1655812232. Its totient is φ = 1655812230.

The previous prime is 1655812201. The next prime is 1655812253. The reversal of 1655812231 is 1322185561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1655812231 - 2²¹ = 1653715079 is a prime.

It is a super-2 number, since 2×1655812231² = 5483428288658394722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1655812201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 827906115 + 827906116.

It is an arithmetic number, because the mean of its divisors is an integer number (827906116).

Almost surely, 2^1655812231 is an apocalyptic number.

1655812231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1655812231 is an equidigital number, since it uses as much as digits as its factorization.

1655812231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14400, while the sum is 34.

The square root of 1655812231 is about 40691.6727476274. The cubic root of 1655812231 is about 1183.0516223046.

Adding to 1655812231 its reverse (1322185561), we get a palindrome (2977997792).

The spelling of 1655812231 in words is "one billion, six hundred fifty-five million, eight hundred twelve thousand, two hundred thirty-one".