81081454 has 4 divisors (see below), whose sum is σ = 121622184. Its totient is φ = 40540726.

The previous prime is 81081443. The next prime is 81081491. The reversal of 81081454 is 45418018.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20270362 + ... + 20270365.

It is an arithmetic number, because the mean of its divisors is an integer number (30405546).

Almost surely, 2^81081454 is an apocalyptic number.

81081454 is a deficient number, since it is larger than the sum of its proper divisors (40540730).

81081454 is a wasteful number, since it uses less digits than its factorization.

81081454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40540729.

The product of its (nonzero) digits is 5120, while the sum is 31.

The square root of 81081454 is about 9004.5240851474. The cubic root of 81081454 is about 432.8198558330.

The spelling of 81081454 in words is "eighty-one million, eighty-one thousand, four hundred fifty-four".