81154450 has 24 divisors (see below), whose sum is σ = 162559908. Its totient is φ = 29964480.

The previous prime is 81154439. The next prime is 81154519. The reversal of 81154450 is 5445118.

It can be written as a sum of positive squares in 6 ways, for example, as 21818241 + 59336209 = 4671^2 + 7703^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61777 + ... + 63076.

Almost surely, 2^81154450 is an apocalyptic number.

81154450 is an abundant number, since it is smaller than the sum of its proper divisors (81405458).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81154450 is a wasteful number, since it uses less digits than its factorization.

81154450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124878 (or 124873 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 28.

The square root of 81154450 is about 9008.5764691210. The cubic root of 81154450 is about 432.9497032074.

Adding to 81154450 its reverse (5445118), we get a palindrome (86599568).

The spelling of 81154450 in words is "eighty-one million, one hundred fifty-four thousand, four hundred fifty".