1215725725 has 6 divisors (see below), whose sum is σ = 1507499930. Its totient is φ = 972580560.

The previous prime is 1215725711. The next prime is 1215725741. The reversal of 1215725725 is 5275275121.

It can be written as a sum of positive squares in 3 ways, for example, as 25613721 + 1190112004 = 5061^2 + 34498^2 .

It is not a de Polignac number, because 1215725725 - 2²⁵ = 1182171293 is a prime.

It is a super-3 number, since 3×1215725725³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24314490 + ... + 24314539.

Almost surely, 2^1215725725 is an apocalyptic number.

It is an amenable number.

1215725725 is a deficient number, since it is larger than the sum of its proper divisors (291774205).

1215725725 is an equidigital number, since it uses as much as digits as its factorization.

1215725725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48629039 (or 48629034 counting only the distinct ones).

The product of its digits is 49000, while the sum is 37.

The square root of 1215725725 is about 34867.2586390155. The cubic root of 1215725725 is about 1067.2804039082.

The spelling of 1215725725 in words is "one billion, two hundred fifteen million, seven hundred twenty-five thousand, seven hundred twenty-five".