1025433991 has 2 divisors, whose sum is σ = 1025433992. Its totient is φ = 1025433990.

The previous prime is 1025433977. The next prime is 1025434031. The reversal of 1025433991 is 1993345201.

It is a weak prime.

It is an emirp because it is prime and its reverse (1993345201) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1025433991 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1025433991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1025433091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 512716995 + 512716996.

It is an arithmetic number, because the mean of its divisors is an integer number (512716996).

Almost surely, 2^1025433991 is an apocalyptic number.

1025433991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1025433991 is an equidigital number, since it uses as much as digits as its factorization.

1025433991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 1025433991 is about 32022.3982705855. The cubic root of 1025433991 is about 1008.4071192747.

The spelling of 1025433991 in words is "one billion, twenty-five million, four hundred thirty-three thousand, nine hundred ninety-one".