80780981 has 2 divisors, whose sum is σ = 80780982. Its totient is φ = 80780980.

The previous prime is 80780933. The next prime is 80780993. The reversal of 80780981 is 18908708.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74822500 + 5958481 = 8650^2 + 2441^2 .

It is a cyclic number.

It is not a de Polignac number, because 80780981 - 2²² = 76586677 is a prime.

It is a super-2 number, since 2×80780981² = 13051133782644722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80780281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40390490 + 40390491.

It is an arithmetic number, because the mean of its divisors is an integer number (40390491).

Almost surely, 2^80780981 is an apocalyptic number.

It is an amenable number.

80780981 is a deficient number, since it is larger than the sum of its proper divisors (1).

80780981 is an equidigital number, since it uses as much as digits as its factorization.

80780981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 41.

The square root of 80780981 is about 8987.8240414463. The cubic root of 80780981 is about 432.2845436924.

The spelling of 80780981 in words is "eighty million, seven hundred eighty thousand, nine hundred eighty-one".