155499 has 8 divisors (see below), whose sum is σ = 219600. Its totient is φ = 97536.

The previous prime is 155473. The next prime is 155501. The reversal of 155499 is 994551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 155499 - 2⁷ = 155371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155299) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1474 + ... + 1575.

It is an arithmetic number, because the mean of its divisors is an integer number (27450).

2¹⁵⁵⁴⁹⁹ is an apocalyptic number.

155499 is a deficient number, since it is larger than the sum of its proper divisors (64101).

155499 is a wasteful number, since it uses less digits than its factorization.

155499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3069.

The product of its digits is 8100, while the sum is 33.

The square root of 155499 is about 394.3336151027. Note that the first 3 decimals coincide. The cubic root of 155499 is about 53.7744363379.

It can be divided in two parts, 1554 and 99, that added together give a triangular number (1653 = T₅₇).

The spelling of 155499 in words is "one hundred fifty-five thousand, four hundred ninety-nine".