1215403125 has 24 divisors (see below), whose sum is σ = 2025557856. Its totient is φ = 648210000.

The previous prime is 1215403093. The next prime is 1215403129. The reversal of 1215403125 is 5213045121.

It is a happy number.

It is not a de Polignac number, because 1215403125 - 2⁵ = 1215403093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1215403095 and 1215403104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215403129) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55447 + ... + 74196.

It is an arithmetic number, because the mean of its divisors is an integer number (84398244).

Almost surely, 2^1215403125 is an apocalyptic number.

1215403125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1215403125 is a deficient number, since it is larger than the sum of its proper divisors (810154731).

1215403125 is an frugal number, since it uses more digits than its factorization.

1215403125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129671 (or 129651 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 1215403125 is about 34862.6322155973. The cubic root of 1215403125 is about 1067.1859925043.

Adding to 1215403125 its reverse (5213045121), we get a palindrome (6428448246).

The spelling of 1215403125 in words is "one billion, two hundred fifteen million, four hundred three thousand, one hundred twenty-five".