80361981 has 24 divisors (see below), whose sum is σ = 132996864. Its totient is φ = 45804960.

The previous prime is 80361979. The next prime is 80361991. The reversal of 80361981 is 18916308.

It is not a de Polignac number, because 80361981 - 2¹ = 80361979 is a prime.

It is a super-2 number, since 2×80361981² = 12916095980488722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80361961) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27660 + ... + 30426.

It is an arithmetic number, because the mean of its divisors is an integer number (5541536).

It is a vampire number, since it can be written as 8301 ⋅ 9681 (with its own digits).

Almost surely, 2^80361981 is an apocalyptic number.

It is an amenable number.

80361981 is a deficient number, since it is larger than the sum of its proper divisors (52634883).

80361981 is a wasteful number, since it uses less digits than its factorization.

80361981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3241 (or 3238 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 80361981 is about 8964.4844246616. The cubic root of 80361981 is about 431.5358472877.

The spelling of 80361981 in words is "eighty million, three hundred sixty-one thousand, nine hundred eighty-one".