1215277125 has 16 divisors (see below), whose sum is σ = 2022221760. Its totient is φ = 648147600.

The previous prime is 1215277117. The next prime is 1215277157. The reversal of 1215277125 is 5217725121.

It is not a de Polignac number, because 1215277125 - 2³ = 1215277117 is a prime.

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, 1619995 + ... + 1620744.

It is an arithmetic number, because the mean of its divisors is an integer number (126388860).

Almost surely, 2^1215277125 is an apocalyptic number.

1215277125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1215277125 is a deficient number, since it is larger than the sum of its proper divisors (806944635).

1215277125 is an equidigital number, since it uses as much as digits as its factorization.

1215277125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3240757 (or 3240747 counting only the distinct ones).

The product of its digits is 9800, while the sum is 33.

The square root of 1215277125 is about 34860.8250762945. The cubic root of 1215277125 is about 1067.1491130857.

The spelling of 1215277125 in words is "one billion, two hundred fifteen million, two hundred seventy-seven thousand, one hundred twenty-five".