81363477 has 8 divisors (see below), whose sum is σ = 116829664. Its totient is φ = 50069808.

The previous prime is 81363467. The next prime is 81363493. The reversal of 81363477 is 77436318.

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

It is not a de Polignac number, because 81363477 - 2⁴ = 81363461 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 2086243 = 81363477 / (8 + 1 + 3 + 6 + 3 + 4 + 7 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81363467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1043083 + ... + 1043160.

It is an arithmetic number, because the mean of its divisors is an integer number (14603708).

Almost surely, 2^81363477 is an apocalyptic number.

It is an amenable number.

81363477 is a deficient number, since it is larger than the sum of its proper divisors (35466187).

81363477 is a wasteful number, since it uses less digits than its factorization.

81363477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2086259.

The product of its digits is 84672, while the sum is 39.

The square root of 81363477 is about 9020.1705637976. The cubic root of 81363477 is about 433.3210962356.

The spelling of 81363477 in words is "eighty-one million, three hundred sixty-three thousand, four hundred seventy-seven".