158761 has 2 divisors, whose sum is σ = 158762. Its totient is φ = 158760.

The previous prime is 158759. The next prime is 158771. The reversal of 158761 is 167851.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99225 + 59536 = 315^2 + 244^2 .

It is a cyclic number.

It is not a de Polignac number, because 158761 - 2¹ = 158759 is a prime.

Together with 158759, it forms a pair of twin primes.

158761 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (158731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79380 + 79381.

It is an arithmetic number, because the mean of its divisors is an integer number (79381).

2¹⁵⁸⁷⁶¹ is an apocalyptic number.

It is an amenable number.

158761 is a deficient number, since it is larger than the sum of its proper divisors (1).

158761 is an equidigital number, since it uses as much as digits as its factorization.

158761 is an evil number, because the sum of its binary digits is even.

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

The square root of 158761 is about 398.4482400513. The cubic root of 158761 is about 54.1478572430.

It can be divided in two parts, 158 and 761, that added together give a palindrome (919).

The spelling of 158761 in words is "one hundred fifty-eight thousand, seven hundred sixty-one".