81474154 has 4 divisors (see below), whose sum is σ = 122211234. Its totient is φ = 40737076.

The previous prime is 81474143. The next prime is 81474161. The reversal of 81474154 is 45147418.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45147418 = 2 ⋅22573709.

It can be written as a sum of positive squares in only one way, i.e., 74425129 + 7049025 = 8627^2 + 2655^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20368537 + ... + 20368540.

Almost surely, 2^81474154 is an apocalyptic number.

81474154 is a deficient number, since it is larger than the sum of its proper divisors (40737080).

81474154 is a wasteful number, since it uses less digits than its factorization.

81474154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40737079.

The product of its digits is 17920, while the sum is 34.

The square root of 81474154 is about 9026.3034515797. The cubic root of 81474154 is about 433.5174863582.

The spelling of 81474154 in words is "eighty-one million, four hundred seventy-four thousand, one hundred fifty-four".