81435361 has 8 divisors (see below), whose sum is σ = 93282624. Its totient is φ = 69641520.

The previous prime is 81435359. The next prime is 81435383. The reversal of 81435361 is 16353418.

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 81435361 - 2¹ = 81435359 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81435301) 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, 10030 + ... + 16231.

It is an arithmetic number, because the mean of its divisors is an integer number (11660328).

Almost surely, 2^81435361 is an apocalyptic number.

It is an amenable number.

81435361 is a deficient number, since it is larger than the sum of its proper divisors (11847263).

81435361 is a wasteful number, since it uses less digits than its factorization.

81435361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26711.

The product of its digits is 8640, while the sum is 31.

The square root of 81435361 is about 9024.1543094076. The cubic root of 81435361 is about 433.4486706137.

Adding to 81435361 its reverse (16353418), we get a palindrome (97788779).

It can be divided in two parts, 81435 and 361, that added together give a square (81796 = 286²).

The spelling of 81435361 in words is "eighty-one million, four hundred thirty-five thousand, three hundred sixty-one".