151999 has 4 divisors (see below), whose sum is σ = 153664. Its totient is φ = 150336.

The previous prime is 151969. The next prime is 152003. The reversal of 151999 is 999151.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999151 = 73 ⋅13687.

It is a cyclic number.

It is not a de Polignac number, because 151999 - 2⁵ = 151967 is a prime.

It is a Duffinian number.

151999 is a modest number, since divided by 999 gives 151 as remainder.

151999 is a lucky number.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 687 + ... + 880.

It is an arithmetic number, because the mean of its divisors is an integer number (38416).

2¹⁵¹⁹⁹⁹ is an apocalyptic number.

151999 is a deficient number, since it is larger than the sum of its proper divisors (1665).

151999 is an equidigital number, since it uses as much as digits as its factorization.

151999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1664.

The product of its digits is 3645, while the sum is 34.

The square root of 151999 is about 389.8704913173. The cubic root of 151999 is about 53.3679159390.

The spelling of 151999 in words is "one hundred fifty-one thousand, nine hundred ninety-nine".