1025575781 has 2 divisors, whose sum is σ = 1025575782. Its totient is φ = 1025575780.

The previous prime is 1025575769. The next prime is 1025575799. The reversal of 1025575781 is 1875755201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 603930625 + 421645156 = 24575^2 + 20534^2 .

It is an emirp because it is prime and its reverse (1875755201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1025575781 - 2²⁶ = 958466917 is a prime.

It is a super-2 number, since 2×1025575781² = 2103611365147519922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1025575721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 512787890 + 512787891.

It is an arithmetic number, because the mean of its divisors is an integer number (512787891).

Almost surely, 2^1025575781 is an apocalyptic number.

It is an amenable number.

1025575781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1025575781 is an equidigital number, since it uses as much as digits as its factorization.

1025575781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 98000, while the sum is 41.

The square root of 1025575781 is about 32024.6121131857. The cubic root of 1025575781 is about 1008.4535956795.

The spelling of 1025575781 in words is "one billion, twenty-five million, five hundred seventy-five thousand, seven hundred eighty-one".