1025680081 has 4 divisors (see below), whose sum is σ = 1035090100. Its totient is φ = 1016270064.

The previous prime is 1025680079. The next prime is 1025680087. The reversal of 1025680081 is 1800865201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 634233856 + 391446225 = 25184^2 + 19785^2 .

It is a cyclic number.

It is not a de Polignac number, because 1025680081 - 2¹ = 1025680079 is a prime.

It is a super-2 number, since 2×1025680081² = 2104039257120333122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1025680087) 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, 4704846 + ... + 4705063.

It is an arithmetic number, because the mean of its divisors is an integer number (258772525).

Almost surely, 2^1025680081 is an apocalyptic number.

It is an amenable number.

1025680081 is a deficient number, since it is larger than the sum of its proper divisors (9410019).

1025680081 is an equidigital number, since it uses as much as digits as its factorization.

1025680081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9410018.

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 1025680081 is about 32026.2405068094. The cubic root of 1025680081 is about 1008.4877807512.

The spelling of 1025680081 in words is "one billion, twenty-five million, six hundred eighty thousand, eighty-one".