1025085781 has 4 divisors (see below), whose sum is σ = 1069654752. Its totient is φ = 980516812.

The previous prime is 1025085709. The next prime is 1025085797. The reversal of 1025085781 is 1875805201.

1025085781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1025085781 - 2⁷ = 1025085653 is a prime.

It is a super-2 number, since 2×1025085781² = 2101601716816759922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1025085781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1025080781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22284451 + ... + 22284496.

It is an arithmetic number, because the mean of its divisors is an integer number (267413688).

Almost surely, 2^1025085781 is an apocalyptic number.

It is an amenable number.

1025085781 is a deficient number, since it is larger than the sum of its proper divisors (44568971).

1025085781 is an equidigital number, since it uses as much as digits as its factorization.

1025085781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44568970.

The product of its (nonzero) digits is 22400, while the sum is 37.

The square root of 1025085781 is about 32016.9608332833. The cubic root of 1025085781 is about 1008.2929636427.

The spelling of 1025085781 in words is "one billion, twenty-five million, eighty-five thousand, seven hundred eighty-one".