155215123 has 16 divisors (see below), whose sum is σ = 187333120. Its totient is φ = 125629056.

The previous prime is 155215121. The next prime is 155215133. The reversal of 155215123 is 321512551.

It is not a de Polignac number, because 155215123 - 2¹ = 155215121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155215121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43090 + ... + 46552.

It is an arithmetic number, because the mean of its divisors is an integer number (11708320).

Almost surely, 2^155215123 is an apocalyptic number.

155215123 is a deficient number, since it is larger than the sum of its proper divisors (32117997).

155215123 is a wasteful number, since it uses less digits than its factorization.

155215123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3826.

The product of its digits is 1500, while the sum is 25.

The square root of 155215123 is about 12458.5361499656. The cubic root of 155215123 is about 537.4169309520.

Adding to 155215123 its reverse (321512551), we get a palindrome (476727674).

The spelling of 155215123 in words is "one hundred fifty-five million, two hundred fifteen thousand, one hundred twenty-three".