81000677 has 2 divisors, whose sum is σ = 81000678. Its totient is φ = 81000676.

The previous prime is 81000653. The next prime is 81000697. The reversal of 81000677 is 77600018.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58967041 + 22033636 = 7679^2 + 4694^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81000677 is a prime.

It is a super-2 number, since 2×81000677² = 13122219348916658, 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 (81000697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40500338 + 40500339.

It is an arithmetic number, because the mean of its divisors is an integer number (40500339).

Almost surely, 2^81000677 is an apocalyptic number.

It is an amenable number.

81000677 is a deficient number, since it is larger than the sum of its proper divisors (1).

81000677 is an equidigital number, since it uses as much as digits as its factorization.

81000677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 81000677 is about 9000.0376110325. The cubic root of 81000677 is about 432.6760765246.

The spelling of 81000677 in words is "eighty-one million, six hundred seventy-seven", and thus it is an aban number.