151905 has 32 divisors (see below), whose sum is σ = 282240. Its totient is φ = 69120.

The previous prime is 151903. The next prime is 151909. The reversal of 151905 is 509151.

It is a happy number.

It is not a de Polignac number, because 151905 - 2¹ = 151903 is a prime.

It is an Ulam number.

151905 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (151901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3685 + ... + 3725.

It is an arithmetic number, because the mean of its divisors is an integer number (8820).

2¹⁵¹⁹⁰⁵ is an apocalyptic number.

151905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

151905 is a deficient number, since it is larger than the sum of its proper divisors (130335).

151905 is a wasteful number, since it uses less digits than its factorization.

151905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81.

The product of its (nonzero) digits is 225, while the sum is 21.

The square root of 151905 is about 389.7499198204. The cubic root of 151905 is about 53.3569123171.

The spelling of 151905 in words is "one hundred fifty-one thousand, nine hundred five".