1215107123 has 4 divisors (see below), whose sum is σ = 1218007560. Its totient is φ = 1212206688.

The previous prime is 1215107107. The next prime is 1215107141. The reversal of 1215107123 is 3217015121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3217015121 = 277 ⋅11613773.

It is a cyclic number.

It is not a de Polignac number, because 1215107123 - 2⁴ = 1215107107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1215107423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1449590 + ... + 1450427.

It is an arithmetic number, because the mean of its divisors is an integer number (304501890).

Almost surely, 2^1215107123 is an apocalyptic number.

1215107123 is a deficient number, since it is larger than the sum of its proper divisors (2900437).

1215107123 is an equidigital number, since it uses as much as digits as its factorization.

1215107123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2900436.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 1215107123 is about 34858.3866953134. The cubic root of 1215107123 is about 1067.0993505144.

The spelling of 1215107123 in words is "one billion, two hundred fifteen million, one hundred seven thousand, one hundred twenty-three".