81083135251001 has 8 divisors (see below), whose sum is σ = 90331344311880. Its totient is φ = 72265075448832.

The previous prime is 81083135250989. The next prime is 81083135251033. The reversal of 81083135251001 is 10015253138018.

It can be written as a sum of positive squares in 4 ways, for example, as 7593750216976 + 73489385034025 = 2755676^2 + 8572595^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-81083135251001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81083135221001) 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, 107537314280 + ... + 107537315033.

It is an arithmetic number, because the mean of its divisors is an integer number (11291418038985).

Almost surely, 2^{81083135251001} is an apocalyptic number.

It is an amenable number.

81083135251001 is a deficient number, since it is larger than the sum of its proper divisors (9248209060879).

81083135251001 is a wasteful number, since it uses less digits than its factorization.

81083135251001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215074629355.

The product of its (nonzero) digits is 28800, while the sum is 38.

Adding to 81083135251001 its reverse (10015253138018), we get a palindrome (91098388389019).

The spelling of 81083135251001 in words is "eighty-one trillion, eighty-three billion, one hundred thirty-five million, two hundred fifty-one thousand, one".