80155981 has 8 divisors (see below), whose sum is σ = 82590840. Its totient is φ = 77755392.

The previous prime is 80155979. The next prime is 80155991. The reversal of 80155981 is 18955108.

It can be written as a sum of positive squares in 4 ways, for example, as 1550025 + 78605956 = 1245^2 + 8866^2 .

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 80155981 - 2¹ = 80155979 is a prime.

It is a super-2 number, since 2×80155981² = 12849962580144722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 80155981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80155921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3780 + ... + 13213.

It is an arithmetic number, because the mean of its divisors is an integer number (10323855).

Almost surely, 2^80155981 is an apocalyptic number.

It is an amenable number.

80155981 is a deficient number, since it is larger than the sum of its proper divisors (2434859).

80155981 is a wasteful number, since it uses less digits than its factorization.

80155981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17135.

The product of its (nonzero) digits is 14400, while the sum is 37.

The square root of 80155981 is about 8952.9872668289. The cubic root of 80155981 is about 431.1667985957.

The spelling of 80155981 in words is "eighty million, one hundred fifty-five thousand, nine hundred eighty-one".