80821155 has 16 divisors (see below), whose sum is σ = 136120320. Its totient is φ = 40835808.

The previous prime is 80821151. The next prime is 80821163. The reversal of 80821155 is 55112808.

It is not a de Polignac number, because 80821155 - 2² = 80821151 is a prime.

It is not an unprimeable number, because it can be changed into a prime (80821151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141507 + ... + 142076.

It is an arithmetic number, because the mean of its divisors is an integer number (8507520).

Almost surely, 2^80821155 is an apocalyptic number.

80821155 is a deficient number, since it is larger than the sum of its proper divisors (55299165).

80821155 is a wasteful number, since it uses less digits than its factorization.

80821155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283610.

The product of its (nonzero) digits is 3200, while the sum is 30.

The square root of 80821155 is about 8990.0586761155. The cubic root of 80821155 is about 432.3561930705.

The spelling of 80821155 in words is "eighty million, eight hundred twenty-one thousand, one hundred fifty-five".