123513215 has 32 divisors (see below), whose sum is σ = 175570944. Its totient is φ = 81648000.

The previous prime is 123513199. The next prime is 123513217. The reversal of 123513215 is 512315321.

It is a happy number.

It is not a de Polignac number, because 123513215 - 2⁴ = 123513199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123513217) 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, 164090 + ... + 164840.

It is an arithmetic number, because the mean of its divisors is an integer number (5486592).

Almost surely, 2^123513215 is an apocalyptic number.

123513215 is a deficient number, since it is larger than the sum of its proper divisors (52057729).

123513215 is a wasteful number, since it uses less digits than its factorization.

123513215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 927.

The product of its digits is 900, while the sum is 23.

The square root of 123513215 is about 11113.6499405011. The cubic root of 123513215 is about 498.0097079875.

Adding to 123513215 its reverse (512315321), we get a palindrome (635828536).

The spelling of 123513215 in words is "one hundred twenty-three million, five hundred thirteen thousand, two hundred fifteen".