80989261 has 4 divisors (see below), whose sum is σ = 81400572. Its totient is φ = 80577952.

The previous prime is 80989243. The next prime is 80989283. The reversal of 80989261 is 16298908.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70459236 + 10530025 = 8394^2 + 3245^2 .

It is a cyclic number.

It is not a de Polignac number, because 80989261 - 2⁷ = 80989133 is a prime.

It is a super-2 number, since 2×80989261² = 13118520794652242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80989231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205360 + ... + 205753.

It is an arithmetic number, because the mean of its divisors is an integer number (20350143).

Almost surely, 2^80989261 is an apocalyptic number.

It is an amenable number.

80989261 is a deficient number, since it is larger than the sum of its proper divisors (411311).

80989261 is a wasteful number, since it uses less digits than its factorization.

80989261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411310.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 80989261 is about 8999.4033691129. The cubic root of 80989261 is about 432.6557488667.

The spelling of 80989261 in words is "eighty million, nine hundred eighty-nine thousand, two hundred sixty-one".