80651381 has 2 divisors, whose sum is σ = 80651382. Its totient is φ = 80651380.

The previous prime is 80651353. The next prime is 80651399. The reversal of 80651381 is 18315608.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72760900 + 7890481 = 8530^2 + 2809^2 .

It is a cyclic number.

It is not a de Polignac number, because 80651381 - 2¹⁸ = 80389237 is a prime.

It is a super-2 number, since 2×80651381² = 13009290514414322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80651881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40325690 + 40325691.

It is an arithmetic number, because the mean of its divisors is an integer number (40325691).

Almost surely, 2^80651381 is an apocalyptic number.

It is an amenable number.

80651381 is a deficient number, since it is larger than the sum of its proper divisors (1).

80651381 is an equidigital number, since it uses as much as digits as its factorization.

80651381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 80651381 is about 8980.6113934409. The cubic root of 80651381 is about 432.0532431090.

Adding to 80651381 its reverse (18315608), we get a palindrome (98966989).

The spelling of 80651381 in words is "eighty million, six hundred fifty-one thousand, three hundred eighty-one".