81494855 has 16 divisors (see below), whose sum is σ = 111513024. Its totient is φ = 56640000.

The previous prime is 81494827. The next prime is 81494863. The reversal of 81494855 is 55849418.

It is not a de Polignac number, because 81494855 - 2¹⁴ = 81478471 is a prime.

It is a super-2 number, since 2×81494855² = 13282822782942050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35771 + ... + 37980.

It is an arithmetic number, because the mean of its divisors is an integer number (6969564).

Almost surely, 2^81494855 is an apocalyptic number.

81494855 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

81494855 is a deficient number, since it is larger than the sum of its proper divisors (30018169).

81494855 is a wasteful number, since it uses less digits than its factorization.

81494855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73786.

The product of its digits is 230400, while the sum is 44.

The square root of 81494855 is about 9027.4500829415. The cubic root of 81494855 is about 433.5541993733.

The spelling of 81494855 in words is "eighty-one million, four hundred ninety-four thousand, eight hundred fifty-five".