81430001 has 2 divisors, whose sum is σ = 81430002. Its totient is φ = 81430000.

The previous prime is 81429989. The next prime is 81430031. The reversal of 81430001 is 10003418.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61858225 + 19571776 = 7865^2 + 4424^2 .

It is a cyclic number.

It is not a de Polignac number, because 81430001 - 2¹⁴ = 81413617 is a prime.

It is not a weakly prime, because it can be changed into another prime (81430031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40715000 + 40715001.

It is an arithmetic number, because the mean of its divisors is an integer number (40715001).

Almost surely, 2^81430001 is an apocalyptic number.

It is an amenable number.

81430001 is a deficient number, since it is larger than the sum of its proper divisors (1).

81430001 is an equidigital number, since it uses as much as digits as its factorization.

81430001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 81430001 is about 9023.8573237834. The cubic root of 81430001 is about 433.4391606751.

Adding to 81430001 its reverse (10003418), we get a palindrome (91433419).

The spelling of 81430001 in words is "eighty-one million, four hundred thirty thousand, one".