81325093501 has 8 divisors (see below), whose sum is σ = 88557271200. Its totient is φ = 74388106800.

The previous prime is 81325093489. The next prime is 81325093523. The reversal of 81325093501 is 10539052318.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 81325093501 - 2³¹ = 79177609853 is a prime.

It is a super-2 number, since 2×81325093501² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81325093541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73797175 + ... + 73798276.

It is an arithmetic number, because the mean of its divisors is an integer number (11069658900).

Almost surely, 2^81325093501 is an apocalyptic number.

It is an amenable number.

81325093501 is a deficient number, since it is larger than the sum of its proper divisors (7232177699).

81325093501 is a wasteful number, since it uses less digits than its factorization.

81325093501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147595499.

The product of its (nonzero) digits is 32400, while the sum is 37.

The spelling of 81325093501 in words is "eighty-one billion, three hundred twenty-five million, ninety-three thousand, five hundred one".