1025181565 has 8 divisors (see below), whose sum is σ = 1237330008. Its totient is φ = 815403840.

The previous prime is 1025181551. The next prime is 1025181571. The reversal of 1025181565 is 5651815201.

It can be written as a sum of positive squares in 4 ways, for example, as 109453444 + 915728121 = 10462^2 + 30261^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1025181565 - 2¹⁷ = 1025050493 is a prime.

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 1025181565.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 591726 + ... + 593455.

It is an arithmetic number, because the mean of its divisors is an integer number (154666251).

Almost surely, 2^1025181565 is an apocalyptic number.

It is an amenable number.

1025181565 is a deficient number, since it is larger than the sum of its proper divisors (212148443).

1025181565 is a wasteful number, since it uses less digits than its factorization.

1025181565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1185359.

The product of its (nonzero) digits is 12000, while the sum is 34.

The square root of 1025181565 is about 32018.4566305123. The cubic root of 1025181565 is about 1008.3243676244.

Adding to 1025181565 its reverse (5651815201), we get a palindrome (6676996766).

The spelling of 1025181565 in words is "one billion, twenty-five million, one hundred eighty-one thousand, five hundred sixty-five".