81534077 has 2 divisors, whose sum is σ = 81534078. Its totient is φ = 81534076.

The previous prime is 81534041. The next prime is 81534097. The reversal of 81534077 is 77043518.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81522841 + 11236 = 9029^2 + 106^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81534077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81534017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40767038 + 40767039.

It is an arithmetic number, because the mean of its divisors is an integer number (40767039).

Almost surely, 2^81534077 is an apocalyptic number.

It is an amenable number.

81534077 is a deficient number, since it is larger than the sum of its proper divisors (1).

81534077 is an equidigital number, since it uses as much as digits as its factorization.

81534077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 81534077 is about 9029.6221958618. The cubic root of 81534077 is about 433.6237421499.

It can be divided in two parts, 8153 and 4077, that multiplied together give a triangular number (33239781 = T₈₁₅₃).

The spelling of 81534077 in words is "eighty-one million, five hundred thirty-four thousand, seventy-seven".