81157101 has 8 divisors (see below), whose sum is σ = 111700224. Its totient is φ = 52359360.

The previous prime is 81157091. The next prime is 81157117. The reversal of 81157101 is 10175118.

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

It is not a de Polignac number, because 81157101 - 2¹⁰ = 81156077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81157121) 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 7 ways as a sum of consecutive naturals, for example, 436236 + ... + 436421.

It is an arithmetic number, because the mean of its divisors is an integer number (13962528).

Almost surely, 2^81157101 is an apocalyptic number.

It is an amenable number.

81157101 is a deficient number, since it is larger than the sum of its proper divisors (30543123).

81157101 is a wasteful number, since it uses less digits than its factorization.

81157101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 872691.

The product of its (nonzero) digits is 280, while the sum is 24.

The square root of 81157101 is about 9008.7236054837. The cubic root of 81157101 is about 432.9544174166.

The spelling of 81157101 in words is "eighty-one million, one hundred fifty-seven thousand, one hundred one".