81343377 has 12 divisors (see below), whose sum is σ = 118984320. Its totient is φ = 53542008.

The previous prime is 81343369. The next prime is 81343397. The reversal of 81343377 is 77334318.

It is not a de Polignac number, because 81343377 - 2³ = 81343369 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (81343307) 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 11 ways as a sum of consecutive naturals, for example, 56493 + ... + 57914.

It is an arithmetic number, because the mean of its divisors is an integer number (9915360).

Almost surely, 2^81343377 is an apocalyptic number.

It is an amenable number.

81343377 is a deficient number, since it is larger than the sum of its proper divisors (37640943).

81343377 is a wasteful number, since it uses less digits than its factorization.

81343377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114492 (or 114489 counting only the distinct ones).

The product of its digits is 42336, while the sum is 36.

The square root of 81343377 is about 9019.0563253591. The cubic root of 81343377 is about 433.2854108082.

It can be divided in two parts, 8134 and 3377, that added together give a palindrome (11511).

The spelling of 81343377 in words is "eighty-one million, three hundred forty-three thousand, three hundred seventy-seven".