81258325 has 6 divisors (see below), whose sum is σ = 100760354. Its totient is φ = 65006640.

The previous prime is 81258323. The next prime is 81258341. The reversal of 81258325 is 52385218.

It can be written as a sum of positive squares in 3 ways, for example, as 2244004 + 79014321 = 1498^2 + 8889^2 .

It is not a de Polignac number, because 81258325 - 2¹ = 81258323 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81258323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1625142 + ... + 1625191.

Almost surely, 2^81258325 is an apocalyptic number.

It is an amenable number.

81258325 is a deficient number, since it is larger than the sum of its proper divisors (19502029).

81258325 is a wasteful number, since it uses less digits than its factorization.

81258325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3250343 (or 3250338 counting only the distinct ones).

The product of its digits is 19200, while the sum is 34.

The square root of 81258325 is about 9014.3399647451. The cubic root of 81258325 is about 433.1343448638.

The spelling of 81258325 in words is "eighty-one million, two hundred fifty-eight thousand, three hundred twenty-five".