81452649 has 8 divisors (see below), whose sum is σ = 108673920. Its totient is φ = 54266576.

The previous prime is 81452647. The next prime is 81452653. The reversal of 81452649 is 94625418.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81452649 - 2¹ = 81452647 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81452647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2817 + ... + 13070.

It is an arithmetic number, because the mean of its divisors is an integer number (13584240).

Almost surely, 2^81452649 is an apocalyptic number.

It is an amenable number.

81452649 is a deficient number, since it is larger than the sum of its proper divisors (27221271).

81452649 is a wasteful number, since it uses less digits than its factorization.

81452649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17599.

The product of its digits is 69120, while the sum is 39.

The square root of 81452649 is about 9025.1121322674. The cubic root of 81452649 is about 433.4793408709.

The spelling of 81452649 in words is "eighty-one million, four hundred fifty-two thousand, six hundred forty-nine".