81250489 has 4 divisors (see below), whose sum is σ = 84052260. Its totient is φ = 78448720.

The previous prime is 81250469. The next prime is 81250511. The reversal of 81250489 is 98405218.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22467600 + 58782889 = 4740^2 + 7667^2 .

It is a cyclic number.

It is not a de Polignac number, because 81250489 - 2¹¹ = 81248441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81250439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1400842 + ... + 1400899.

It is an arithmetic number, because the mean of its divisors is an integer number (21013065).

Almost surely, 2^81250489 is an apocalyptic number.

It is an amenable number.

81250489 is a deficient number, since it is larger than the sum of its proper divisors (2801771).

81250489 is a wasteful number, since it uses less digits than its factorization.

81250489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2801770.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 81250489 is about 9013.9053134588. The cubic root of 81250489 is about 433.1204215732.

The spelling of 81250489 in words is "eighty-one million, two hundred fifty thousand, four hundred eighty-nine".