81948677 has 2 divisors, whose sum is σ = 81948678. Its totient is φ = 81948676.

The previous prime is 81948641. The next prime is 81948731. The reversal of 81948677 is 77684918.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78872161 + 3076516 = 8881^2 + 1754^2 .

It is a cyclic number.

It is not a de Polignac number, because 81948677 - 2¹⁴ = 81932293 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81948077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40974338 + 40974339.

It is an arithmetic number, because the mean of its divisors is an integer number (40974339).

Almost surely, 2^81948677 is an apocalyptic number.

It is an amenable number.

81948677 is a deficient number, since it is larger than the sum of its proper divisors (1).

81948677 is an equidigital number, since it uses as much as digits as its factorization.

81948677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 677376, while the sum is 50.

The square root of 81948677 is about 9052.5508559742. The cubic root of 81948677 is about 434.3574907077.

The spelling of 81948677 in words is "eighty-one million, nine hundred forty-eight thousand, six hundred seventy-seven".