123151515 has 32 divisors (see below), whose sum is σ = 202245120. Its totient is φ = 63961344.

The previous prime is 123151481. The next prime is 123151517. The reversal of 123151515 is 515151321.

It is not a de Polignac number, because 123151515 - 2¹² = 123147419 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123151517) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 216151 + ... + 216719.

It is an arithmetic number, because the mean of its divisors is an integer number (6320160).

Almost surely, 2^123151515 is an apocalyptic number.

123151515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

123151515 is a deficient number, since it is larger than the sum of its proper divisors (79093605).

123151515 is a wasteful number, since it uses less digits than its factorization.

123151515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 931.

The product of its digits is 750, while the sum is 24.

The square root of 123151515 is about 11097.3652278367. The cubic root of 123151515 is about 497.5231035625.

The spelling of 123151515 in words is "one hundred twenty-three million, one hundred fifty-one thousand, five hundred fifteen".