157391 has 4 divisors (see below), whose sum is σ = 169512. Its totient is φ = 145272.

The previous prime is 157363. The next prime is 157393. The reversal of 157391 is 193751.

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 157391 - 2⁶ = 157327 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 157391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6041 + ... + 6066.

It is an arithmetic number, because the mean of its divisors is an integer number (42378).

2¹⁵⁷³⁹¹ is an apocalyptic number.

157391 is a deficient number, since it is larger than the sum of its proper divisors (12121).

157391 is a wasteful number, since it uses less digits than its factorization.

157391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12120.

The product of its digits is 945, while the sum is 26.

The square root of 157391 is about 396.7253457998. The cubic root of 157391 is about 53.9916539456.

The spelling of 157391 in words is "one hundred fifty-seven thousand, three hundred ninety-one".