81025130 has 16 divisors (see below), whose sum is σ = 150874920. Its totient is φ = 31292352.

The previous prime is 81025127. The next prime is 81025163. The reversal of 81025130 is 3152018.

It can be written as a sum of positive squares in 4 ways, for example, as 49294441 + 31730689 = 7021^2 + 5633^2 .

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, 139409 + ... + 139988.

Almost surely, 2^81025130 is an apocalyptic number.

81025130 is a deficient number, since it is larger than the sum of its proper divisors (69849790).

81025130 is a wasteful number, since it uses less digits than its factorization.

81025130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279433.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 81025130 is about 9001.3960028431. The cubic root of 81025130 is about 432.7196118134.

Adding to 81025130 its reverse (3152018), we get a palindrome (84177148).

The spelling of 81025130 in words is "eighty-one million, twenty-five thousand, one hundred thirty".