81350857 has 8 divisors (see below), whose sum is σ = 93344832. Its totient is φ = 69450000.

The previous prime is 81350807. The next prime is 81350861. The reversal of 81350857 is 75805318.

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 81350857 - 2¹¹ = 81348809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81350807) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21394 + ... + 24907.

It is an arithmetic number, because the mean of its divisors is an integer number (11668104).

Almost surely, 2^81350857 is an apocalyptic number.

It is an amenable number.

81350857 is a deficient number, since it is larger than the sum of its proper divisors (11993975).

81350857 is a wasteful number, since it uses less digits than its factorization.

81350857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46559.

The product of its (nonzero) digits is 33600, while the sum is 37.

The square root of 81350857 is about 9019.4709933565. The cubic root of 81350857 is about 433.2986914450.

The spelling of 81350857 in words is "eighty-one million, three hundred fifty thousand, eight hundred fifty-seven".