123551215 has 16 divisors (see below), whose sum is σ = 151911936. Its totient is φ = 96428800.

The previous prime is 123551201. The next prime is 123551221. The reversal of 123551215 is 512155321.

It is a de Polignac number, because none of the positive numbers 2^k-123551215 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123551215.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49395 + ... + 51835.

It is an arithmetic number, because the mean of its divisors is an integer number (9494496).

Almost surely, 2^123551215 is an apocalyptic number.

123551215 is a deficient number, since it is larger than the sum of its proper divisors (28360721).

123551215 is a wasteful number, since it uses less digits than its factorization.

123551215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2690.

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

The square root of 123551215 is about 11115.3594183904. The cubic root of 123551215 is about 498.0607752046.

The spelling of 123551215 in words is "one hundred twenty-three million, five hundred fifty-one thousand, two hundred fifteen".