81362555 has 8 divisors (see below), whose sum is σ = 98062800. Its totient is φ = 64804896.

The previous prime is 81362551. The next prime is 81362557. The reversal of 81362555 is 55526318.

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

It is a cyclic number.

It is not a de Polignac number, because 81362555 - 2² = 81362551 is a prime.

It is a super-2 number, since 2×81362555² = 13239730712256050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81362551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34385 + ... + 36674.

It is an arithmetic number, because the mean of its divisors is an integer number (12257850).

Almost surely, 2^81362555 is an apocalyptic number.

81362555 is a deficient number, since it is larger than the sum of its proper divisors (16700245).

81362555 is a wasteful number, since it uses less digits than its factorization.

81362555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71293.

The product of its digits is 36000, while the sum is 35.

The square root of 81362555 is about 9020.1194559717. The cubic root of 81362555 is about 433.3194594506.

The spelling of 81362555 in words is "eighty-one million, three hundred sixty-two thousand, five hundred fifty-five".