81495430 has 8 divisors (see below), whose sum is σ = 146691792. Its totient is φ = 32598168.

The previous prime is 81495377. The next prime is 81495437. The reversal of 81495430 is 3459418.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×81495430² = 13283010221769800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81495437) 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 3 ways as a sum of consecutive naturals, for example, 4074762 + ... + 4074781.

It is an arithmetic number, because the mean of its divisors is an integer number (18336474).

Almost surely, 2^81495430 is an apocalyptic number.

81495430 is a deficient number, since it is larger than the sum of its proper divisors (65196362).

81495430 is a wasteful number, since it uses less digits than its factorization.

81495430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8149550.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 81495430 is about 9027.4819301952. The cubic root of 81495430 is about 433.5552190412. Note that the first 3 decimals are identical.

The spelling of 81495430 in words is "eighty-one million, four hundred ninety-five thousand, four hundred thirty".