81823377 has 4 divisors (see below), whose sum is σ = 109097840. Its totient is φ = 54548916.

The previous prime is 81823369. The next prime is 81823393. The reversal of 81823377 is 77332818.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 81823377 - 2³ = 81823369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81823327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13637227 + ... + 13637232.

It is an arithmetic number, because the mean of its divisors is an integer number (27274460).

Almost surely, 2^81823377 is an apocalyptic number.

It is an amenable number.

81823377 is a deficient number, since it is larger than the sum of its proper divisors (27274463).

81823377 is a wasteful number, since it uses less digits than its factorization.

81823377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27274462.

The product of its digits is 56448, while the sum is 39.

The square root of 81823377 is about 9045.6275072545. The cubic root of 81823377 is about 434.1359994123.

The spelling of 81823377 in words is "eighty-one million, eight hundred twenty-three thousand, three hundred seventy-seven".