1025663591 has 2 divisors, whose sum is σ = 1025663592. Its totient is φ = 1025663590.

The previous prime is 1025663581. The next prime is 1025663603. The reversal of 1025663591 is 1953665201.

1025663591 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1025663591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1025663521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 512831795 + 512831796.

It is an arithmetic number, because the mean of its divisors is an integer number (512831796).

Almost surely, 2^1025663591 is an apocalyptic number.

1025663591 is a deficient number, since it is larger than the sum of its proper divisors (1).

1025663591 is an equidigital number, since it uses as much as digits as its factorization.

1025663591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48600, while the sum is 38.

The square root of 1025663591 is about 32025.9830606338. The cubic root of 1025663591 is about 1008.4823761899.

The spelling of 1025663591 in words is "one billion, twenty-five million, six hundred sixty-three thousand, five hundred ninety-one".