81250101 has 16 divisors (see below), whose sum is σ = 124254720. Its totient is φ = 52418880.

The previous prime is 81250073. The next prime is 81250133. The reversal of 81250101 is 10105218.

It is not a de Polignac number, because 81250101 - 2⁹ = 81249589 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81250601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47700 + ... + 49373.

It is an arithmetic number, because the mean of its divisors is an integer number (7765920).

Almost surely, 2^81250101 is an apocalyptic number.

It is an amenable number.

81250101 is a deficient number, since it is larger than the sum of its proper divisors (43004619).

81250101 is a wasteful number, since it uses less digits than its factorization.

81250101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97113 (or 97107 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 81250101 is about 9013.8837911302. The cubic root of 81250101 is about 433.1197321374.

Adding to 81250101 its reverse (10105218), we get a palindrome (91355319).

The spelling of 81250101 in words is "eighty-one million, two hundred fifty thousand, one hundred one".