81134057 has 2 divisors, whose sum is σ = 81134058. Its totient is φ = 81134056.

The previous prime is 81134051. The next prime is 81134063. The reversal of 81134057 is 75043118.

It is a balanced prime because it is at equal distance from previous prime (81134051) and next prime (81134063).

It can be written as a sum of positive squares in only one way, i.e., 64577296 + 16556761 = 8036^2 + 4069^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81134057 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81134051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40567028 + 40567029.

It is an arithmetic number, because the mean of its divisors is an integer number (40567029).

Almost surely, 2^81134057 is an apocalyptic number.

It is an amenable number.

81134057 is a deficient number, since it is larger than the sum of its proper divisors (1).

81134057 is an equidigital number, since it uses as much as digits as its factorization.

81134057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 81134057 is about 9007.4445321634. Note that the first 3 decimals coincide. The cubic root of 81134057 is about 432.9134353956.

It can be divided in two parts, 8113 and 4057, that multiplied together give a triangular number (32914441 = T₈₁₁₃).

The spelling of 81134057 in words is "eighty-one million, one hundred thirty-four thousand, fifty-seven".