81484057 has 2 divisors, whose sum is σ = 81484058. Its totient is φ = 81484056.

The previous prime is 81484037. The next prime is 81484069. The reversal of 81484057 is 75048418.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55890576 + 25593481 = 7476^2 + 5059^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81484057 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81484037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40742028 + 40742029.

It is an arithmetic number, because the mean of its divisors is an integer number (40742029).

Almost surely, 2^81484057 is an apocalyptic number.

It is an amenable number.

81484057 is a deficient number, since it is larger than the sum of its proper divisors (1).

81484057 is an equidigital number, since it uses as much as digits as its factorization.

81484057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35840, while the sum is 37.

The square root of 81484057 is about 9026.8519983436. The cubic root of 81484057 is about 433.5350500048.

The spelling of 81484057 in words is "eighty-one million, four hundred eighty-four thousand, fifty-seven".