81245030401 has 8 divisors (see below), whose sum is σ = 82208372904. Its totient is φ = 80284254720.

The previous prime is 81245030381. The next prime is 81245030407. The reversal of 81245030401 is 10403054218.

It can be written as a sum of positive squares in 4 ways, for example, as 134560000 + 81110470401 = 11600^2 + 284799^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81245030401 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81245030401.

It is not an unprimeable number, because it can be changed into a prime (81245030407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 577990 + ... + 704671.

It is an arithmetic number, because the mean of its divisors is an integer number (10276046613).

Almost surely, 2^81245030401 is an apocalyptic number.

It is an amenable number.

81245030401 is a deficient number, since it is larger than the sum of its proper divisors (963342503).

81245030401 is a wasteful number, since it uses less digits than its factorization.

81245030401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1283411.

The product of its (nonzero) digits is 3840, while the sum is 28.

Adding to 81245030401 its reverse (10403054218), we get a palindrome (91648084619).

The spelling of 81245030401 in words is "eighty-one billion, two hundred forty-five million, thirty thousand, four hundred one".