155000015 has 4 divisors (see below), whose sum is σ = 186000024. Its totient is φ = 124000008.

The previous prime is 154999981. The next prime is 155000023. The reversal of 155000015 is 510000551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 510000551 = 23 ⋅22173937.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155000015 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 154999957 and 155000002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15499997 + ... + 15500006.

It is an arithmetic number, because the mean of its divisors is an integer number (46500006).

Almost surely, 2^155000015 is an apocalyptic number.

155000015 is a deficient number, since it is larger than the sum of its proper divisors (31000009).

155000015 is an equidigital number, since it uses as much as digits as its factorization.

155000015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31000008.

The product of its (nonzero) digits is 125, while the sum is 17.

The square root of 155000015 is about 12449.9002004032. The cubic root of 155000015 is about 537.1685528225.

Adding to 155000015 its reverse (510000551), we get a palindrome (665000566).

The spelling of 155000015 in words is "one hundred fifty-five million, fifteen", and thus it is an aban number.