81254401 has 2 divisors, whose sum is σ = 81254402. Its totient is φ = 81254400.

The previous prime is 81254363. The next prime is 81254417. The reversal of 81254401 is 10445218.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80730225 + 524176 = 8985^2 + 724^2 .

It is a cyclic number.

It is not a de Polignac number, because 81254401 - 2¹⁵ = 81221633 is a prime.

It is not a weakly prime, because it can be changed into another prime (81254471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40627200 + 40627201.

It is an arithmetic number, because the mean of its divisors is an integer number (40627201).

Almost surely, 2^81254401 is an apocalyptic number.

It is an amenable number.

81254401 is a deficient number, since it is larger than the sum of its proper divisors (1).

81254401 is an equidigital number, since it uses as much as digits as its factorization.

81254401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 81254401 is about 9014.1223089106. The cubic root of 81254401 is about 433.1273726694.

Adding to 81254401 its reverse (10445218), we get a palindrome (91699619).

The spelling of 81254401 in words is "eighty-one million, two hundred fifty-four thousand, four hundred one".