81674077 has 2 divisors, whose sum is σ = 81674078. Its totient is φ = 81674076.

The previous prime is 81674053. The next prime is 81674093. The reversal of 81674077 is 77047618.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75846681 + 5827396 = 8709^2 + 2414^2 .

It is a cyclic number.

It is not a de Polignac number, because 81674077 - 2²³ = 73285469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81674017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40837038 + 40837039.

It is an arithmetic number, because the mean of its divisors is an integer number (40837039).

Almost surely, 2^81674077 is an apocalyptic number.

It is an amenable number.

81674077 is a deficient number, since it is larger than the sum of its proper divisors (1).

81674077 is an equidigital number, since it uses as much as digits as its factorization.

81674077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 65856, while the sum is 40.

The square root of 81674077 is about 9037.3711332444. The cubic root of 81674077 is about 433.8717881732.

The spelling of 81674077 in words is "eighty-one million, six hundred seventy-four thousand, seventy-seven".