157999 has 2 divisors, whose sum is σ = 158000. Its totient is φ = 157998.

The previous prime is 157991. The next prime is 158003. The reversal of 157999 is 999751.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 157999 - 2³ = 157991 is a prime.

It is a Chen prime.

157999 is a modest number, since divided by 999 gives 157 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78999 + 79000.

It is an arithmetic number, because the mean of its divisors is an integer number (79000).

2¹⁵⁷⁹⁹⁹ is an apocalyptic number.

157999 is a deficient number, since it is larger than the sum of its proper divisors (1).

157999 is an equidigital number, since it uses as much as digits as its factorization.

157999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25515, while the sum is 40.

The square root of 157999 is about 397.4908803985. The cubic root of 157999 is about 54.0610877041.

It can be divided in two parts, 157 and 999, that added together give a square (1156 = 34²).

The spelling of 157999 in words is "one hundred fifty-seven thousand, nine hundred ninety-nine".