81038451 has 8 divisors (see below), whose sum is σ = 116362960. Its totient is φ = 49869792.

The previous prime is 81038429. The next prime is 81038459. The reversal of 81038451 is 15483018.

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

It is not a de Polignac number, because 81038451 - 2¹⁰ = 81037427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81038459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1038916 + ... + 1038993.

It is an arithmetic number, because the mean of its divisors is an integer number (14545370).

Almost surely, 2^81038451 is an apocalyptic number.

81038451 is a deficient number, since it is larger than the sum of its proper divisors (35324509).

81038451 is a wasteful number, since it uses less digits than its factorization.

81038451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2077925.

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 81038451 is about 9002.1359132153. The cubic root of 81038451 is about 432.7433243830.

The spelling of 81038451 in words is "eighty-one million, thirty-eight thousand, four hundred fifty-one".