81746157 has 8 divisors (see below), whose sum is σ = 112753440. Its totient is φ = 52618160.

The previous prime is 81746143. The next prime is 81746167. The reversal of 81746157 is 75164718.

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 81746157 - 2⁷ = 81746029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81746167) 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, 469719 + ... + 469892.

It is an arithmetic number, because the mean of its divisors is an integer number (14094180).

Almost surely, 2^81746157 is an apocalyptic number.

81746157 is a gapful number since it is divisible by the number (87) formed by its first and last digit.

It is an amenable number.

81746157 is a deficient number, since it is larger than the sum of its proper divisors (31007283).

81746157 is a wasteful number, since it uses less digits than its factorization.

81746157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 939643.

The product of its digits is 47040, while the sum is 39.

The square root of 81746157 is about 9041.3581391293. The cubic root of 81746157 is about 433.9993859137. Note that the first 3 decimals are identical.

The spelling of 81746157 in words is "eighty-one million, seven hundred forty-six thousand, one hundred fifty-seven".