81475514 has 4 divisors (see below), whose sum is σ = 122213274. Its totient is φ = 40737756.

The previous prime is 81475507. The next prime is 81475531. The reversal of 81475514 is 41557418.

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

It can be written as a sum of positive squares in only one way, i.e., 79798489 + 1677025 = 8933^2 + 1295^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20368877 + ... + 20368880.

Almost surely, 2^81475514 is an apocalyptic number.

81475514 is a deficient number, since it is larger than the sum of its proper divisors (40737760).

81475514 is a wasteful number, since it uses less digits than its factorization.

81475514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40737759.

The product of its digits is 22400, while the sum is 35.

The square root of 81475514 is about 9026.3787866453. The cubic root of 81475514 is about 433.5198984954.

The spelling of 81475514 in words is "eighty-one million, four hundred seventy-five thousand, five hundred fourteen".