81241450 has 12 divisors (see below), whose sum is σ = 151109190. Its totient is φ = 32496560.

The previous prime is 81241439. The next prime is 81241493. The reversal of 81241450 is 5414218.

It can be written as a sum of positive squares in 3 ways, for example, as 35557369 + 45684081 = 5963^2 + 6759^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 812365 + ... + 812464.

Almost surely, 2^81241450 is an apocalyptic number.

81241450 is a deficient number, since it is larger than the sum of its proper divisors (69867740).

81241450 is a wasteful number, since it uses less digits than its factorization.

81241450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1624841 (or 1624836 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 81241450 is about 9013.4039075146. The cubic root of 81241450 is about 433.1043596363.

Adding to 81241450 its reverse (5414218), we get a palindrome (86655668).

The spelling of 81241450 in words is "eighty-one million, two hundred forty-one thousand, four hundred fifty".