81250127 has 4 divisors (see below), whose sum is σ = 92857296. Its totient is φ = 69642960.

The previous prime is 81250073. The next prime is 81250133. The reversal of 81250127 is 72105218.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81250127 - 2¹² = 81246031 is a prime.

It is a super-2 number, since 2×81250127² = 13203166275032258, which contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 81250096 and 81250105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81250027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5803574 + ... + 5803587.

It is an arithmetic number, because the mean of its divisors is an integer number (23214324).

Almost surely, 2^81250127 is an apocalyptic number.

81250127 is a deficient number, since it is larger than the sum of its proper divisors (11607169).

81250127 is a wasteful number, since it uses less digits than its factorization.

81250127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11607168.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 81250127 is about 9013.8852333497. The cubic root of 81250127 is about 433.1197783367.

The spelling of 81250127 in words is "eighty-one million, two hundred fifty thousand, one hundred twenty-seven".