81552155 has 8 divisors (see below), whose sum is σ = 98198352. Its totient is φ = 65017888.

The previous prime is 81552151. The next prime is 81552173. The reversal of 81552155 is 55125518.

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 81552155 - 2² = 81552151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81552151) 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, 26369 + ... + 29298.

It is an arithmetic number, because the mean of its divisors is an integer number (12274794).

Almost surely, 2^81552155 is an apocalyptic number.

81552155 is a deficient number, since it is larger than the sum of its proper divisors (16646197).

81552155 is a wasteful number, since it uses less digits than its factorization.

81552155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55965.

The product of its digits is 10000, while the sum is 32.

The square root of 81552155 is about 9030.6231789395. The cubic root of 81552155 is about 433.6557879358.

The spelling of 81552155 in words is "eighty-one million, five hundred fifty-two thousand, one hundred fifty-five".