81750157 has 4 divisors (see below), whose sum is σ = 82374336. Its totient is φ = 81125980.

The previous prime is 81750133. The next prime is 81750167. The reversal of 81750157 is 75105718.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81750157 - 2¹¹ = 81748109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81750167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 311893 + ... + 312154.

It is an arithmetic number, because the mean of its divisors is an integer number (20593584).

Almost surely, 2^81750157 is an apocalyptic number.

It is an amenable number.

81750157 is a deficient number, since it is larger than the sum of its proper divisors (624179).

81750157 is a wasteful number, since it uses less digits than its factorization.

81750157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624178.

The product of its (nonzero) digits is 9800, while the sum is 34.

The square root of 81750157 is about 9041.5793421282. The cubic root of 81750157 is about 434.0064646124.

The spelling of 81750157 in words is "eighty-one million, seven hundred fifty thousand, one hundred fifty-seven".