81007451 has 8 divisors (see below), whose sum is σ = 94098144. Its totient is φ = 68296320.

The previous prime is 81007439. The next prime is 81007463. The reversal of 81007451 is 15470018.

It is an interprime number because it is at equal distance from previous prime (81007439) and next prime (81007463).

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 81007451 - 2²⁶ = 13898587 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81007451.

It is not an unprimeable number, because it can be changed into a prime (81007481) 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, 94430 + ... + 95283.

It is an arithmetic number, because the mean of its divisors is an integer number (11762268).

Almost surely, 2^81007451 is an apocalyptic number.

81007451 is a deficient number, since it is larger than the sum of its proper divisors (13090693).

81007451 is a wasteful number, since it uses less digits than its factorization.

81007451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189781.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 81007451 is about 9000.4139349254. The cubic root of 81007451 is about 432.6881376009.

Adding to 81007451 its reverse (15470018), we get a palindrome (96477469).

It can be divided in two parts, 8100 and 7451, that added together give a palindrome (15551).

The spelling of 81007451 in words is "eighty-one million, seven thousand, four hundred fifty-one".