81540355 has 8 divisors (see below), whose sum is σ = 105375312. Its totient is φ = 60214368.

The previous prime is 81540353. The next prime is 81540367. The reversal of 81540355 is 55304518.

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 81540355 - 2¹ = 81540353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81540353) 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, 627169 + ... + 627298.

It is an arithmetic number, because the mean of its divisors is an integer number (13171914).

Almost surely, 2^81540355 is an apocalyptic number.

81540355 is a deficient number, since it is larger than the sum of its proper divisors (23834957).

81540355 is a wasteful number, since it uses less digits than its factorization.

81540355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1254485.

The product of its (nonzero) digits is 12000, while the sum is 31.

The square root of 81540355 is about 9029.9698227624. The cubic root of 81540355 is about 433.6348713206.

The spelling of 81540355 in words is "eighty-one million, five hundred forty thousand, three hundred fifty-five".