81379495 has 8 divisors (see below), whose sum is σ = 100805760. Its totient is φ = 63003360.

The previous prime is 81379483. The next prime is 81379511. The reversal of 81379495 is 59497318.

It is a happy number.

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

It is not a de Polignac number, because 81379495 - 2⁷ = 81379367 is a prime.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 262360 + ... + 262669.

It is an arithmetic number, because the mean of its divisors is an integer number (12600720).

Almost surely, 2^81379495 is an apocalyptic number.

81379495 is a deficient number, since it is larger than the sum of its proper divisors (19426265).

81379495 is a wasteful number, since it uses less digits than its factorization.

81379495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525065.

The product of its digits is 272160, while the sum is 46.

The square root of 81379495 is about 9021.0584190548. The cubic root of 81379495 is about 433.3495302953.

It can be divided in two parts, 813 and 79495, that added together give a palindrome (80308).

The spelling of 81379495 in words is "eighty-one million, three hundred seventy-nine thousand, four hundred ninety-five".