81054049 has 2 divisors, whose sum is σ = 81054050. Its totient is φ = 81054048.

The previous prime is 81054041. The next prime is 81054053. The reversal of 81054049 is 94045018.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66308449 + 14745600 = 8143^2 + 3840^2 .

It is a cyclic number.

It is not a de Polignac number, because 81054049 - 2³ = 81054041 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81054049.

It is not a weakly prime, because it can be changed into another prime (81054041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40527024 + 40527025.

It is an arithmetic number, because the mean of its divisors is an integer number (40527025).

Almost surely, 2^81054049 is an apocalyptic number.

It is an amenable number.

81054049 is a deficient number, since it is larger than the sum of its proper divisors (1).

81054049 is an equidigital number, since it uses as much as digits as its factorization.

81054049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 81054049 is about 9003.0022214815. The cubic root of 81054049 is about 432.7710869132.

The spelling of 81054049 in words is "eighty-one million, fifty-four thousand, forty-nine".