151805 has 8 divisors (see below), whose sum is σ = 184632. Its totient is φ = 119808.

The previous prime is 151799. The next prime is 151813. The reversal of 151805 is 508151.

It can be written as a sum of positive squares in 4 ways, for example, as 484 + 151321 = 22^2 + 389^2 .

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 151805 - 2⁸ = 151549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 329 + ... + 641.

It is an arithmetic number, because the mean of its divisors is an integer number (23079).

2¹⁵¹⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

151805 is a deficient number, since it is larger than the sum of its proper divisors (32827).

151805 is an equidigital number, since it uses as much as digits as its factorization.

151805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415.

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 151805 is about 389.6216113103. The cubic root of 151805 is about 53.3452013519.

Adding to 151805 its reverse (508151), we get a palindrome (659956).

The spelling of 151805 in words is "one hundred fifty-one thousand, eight hundred five".