81180487 has 2 divisors, whose sum is σ = 81180488. Its totient is φ = 81180486.

The previous prime is 81180481. The next prime is 81180499. The reversal of 81180487 is 78408118.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81180487 - 2¹⁵ = 81147719 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81180481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40590243 + 40590244.

It is an arithmetic number, because the mean of its divisors is an integer number (40590244).

Almost surely, 2^81180487 is an apocalyptic number.

81180487 is a deficient number, since it is larger than the sum of its proper divisors (1).

81180487 is an equidigital number, since it uses as much as digits as its factorization.

81180487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14336, while the sum is 37.

The square root of 81180487 is about 9010.0214761120. The cubic root of 81180487 is about 432.9959997284.

The spelling of 81180487 in words is "eighty-one million, one hundred eighty thousand, four hundred eighty-seven".