157861 has 8 divisors (see below), whose sum is σ = 175104. Its totient is φ = 141120.

The previous prime is 157841. The next prime is 157867. The reversal of 157861 is 168751.

It is a happy number.

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 157861 - 2⁷ = 157733 is a prime.

It is a Duffinian number.

157861 is a lucky number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157867) 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, 1180 + ... + 1306.

It is an arithmetic number, because the mean of its divisors is an integer number (21888).

2¹⁵⁷⁸⁶¹ is an apocalyptic number.

157861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

157861 is a deficient number, since it is larger than the sum of its proper divisors (17243).

157861 is a wasteful number, since it uses less digits than its factorization.

157861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251.

The product of its digits is 1680, while the sum is 28.

The square root of 157861 is about 397.3172535896. The cubic root of 157861 is about 54.0453437158.

The spelling of 157861 in words is "one hundred fifty-seven thousand, eight hundred sixty-one".