81418250 has 16 divisors (see below), whose sum is σ = 152415432. Its totient is φ = 32567200.

The previous prime is 81418223. The next prime is 81418261. The reversal of 81418250 is 5281418.

It can be written as a sum of positive squares in 4 ways, for example, as 9728161 + 71690089 = 3119^2 + 8467^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162587 + ... + 163086.

Almost surely, 2^81418250 is an apocalyptic number.

81418250 is a deficient number, since it is larger than the sum of its proper divisors (70997182).

81418250 is a wasteful number, since it uses less digits than its factorization.

81418250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325690 (or 325680 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 81418250 is about 9023.2061929228. The cubic root of 81418250 is about 433.4183100937.

Adding to 81418250 its reverse (5281418), we get a palindrome (86699668).

The spelling of 81418250 in words is "eighty-one million, four hundred eighteen thousand, two hundred fifty".