81145054 has 4 divisors (see below), whose sum is σ = 121717584. Its totient is φ = 40572526.

The previous prime is 81145039. The next prime is 81145069. The reversal of 81145054 is 45054118.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45054118 = 2 ⋅22527059.

It is an interprime number because it is at equal distance from previous prime (81145039) and next prime (81145069).

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, 20286262 + ... + 20286265.

It is an arithmetic number, because the mean of its divisors is an integer number (30429396).

Almost surely, 2^81145054 is an apocalyptic number.

81145054 is a deficient number, since it is larger than the sum of its proper divisors (40572530).

81145054 is a wasteful number, since it uses less digits than its factorization.

81145054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40572529.

The product of its (nonzero) digits is 3200, while the sum is 28.

The square root of 81145054 is about 9008.0549509869. The cubic root of 81145054 is about 432.9329937010.

The spelling of 81145054 in words is "eighty-one million, one hundred forty-five thousand, fifty-four".