1031255591 has 2 divisors, whose sum is σ = 1031255592. Its totient is φ = 1031255590.

The previous prime is 1031255587. The next prime is 1031255593. The reversal of 1031255591 is 1955521301.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1031255591 - 2² = 1031255587 is a prime.

Together with 1031255593, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1031255593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 515627795 + 515627796.

It is an arithmetic number, because the mean of its divisors is an integer number (515627796).

Almost surely, 2^1031255591 is an apocalyptic number.

1031255591 is a deficient number, since it is larger than the sum of its proper divisors (1).

1031255591 is an equidigital number, since it uses as much as digits as its factorization.

1031255591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6750, while the sum is 32.

The square root of 1031255591 is about 32113.1684982968. The cubic root of 1031255591 is about 1010.3118309763.

Adding to 1031255591 its reverse (1955521301), we get a palindrome (2986776892).

The spelling of 1031255591 in words is "one billion, thirty-one million, two hundred fifty-five thousand, five hundred ninety-one".