81054401 has 2 divisors, whose sum is σ = 81054402. Its totient is φ = 81054400.

The previous prime is 81054373. The next prime is 81054427. The reversal of 81054401 is 10445018.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60078001 + 20976400 = 7751^2 + 4580^2 .

It is a cyclic number.

It is not a de Polignac number, because 81054401 - 2²² = 76860097 is a prime.

It is not a weakly prime, because it can be changed into another prime (81054431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40527200 + 40527201.

It is an arithmetic number, because the mean of its divisors is an integer number (40527201).

Almost surely, 2^81054401 is an apocalyptic number.

It is an amenable number.

81054401 is a deficient number, since it is larger than the sum of its proper divisors (1).

81054401 is an equidigital number, since it uses as much as digits as its factorization.

81054401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 81054401 is about 9003.0217704946. The cubic root of 81054401 is about 432.7717133891.

Adding to 81054401 its reverse (10445018), we get a palindrome (91499419).

The spelling of 81054401 in words is "eighty-one million, fifty-four thousand, four hundred one".