1215429076225 has 81 divisors (see below), whose sum is σ = 1899213299433. Its totient is φ = 769009026240.

The previous prime is 1215429076223. The next prime is 1215429076231. The reversal of 1215429076225 is 5226709245121.

The square root of 1215429076225 is 1102465.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 313278642369 + 902150433856 = 559713^2 + 949816^2 .

It is not a de Polignac number, because 1215429076225 - 2¹ = 1215429076223 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1215429076223) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 501620364 + ... + 501622786.

Almost surely, 2^{1215429076225} is an apocalyptic number.

1215429076225 is the 1102465-th square number.

1215429076225 is the 551233-rd centered octagonal number.

It is an amenable number.

1215429076225 is a deficient number, since it is larger than the sum of its proper divisors (683784223208).

1215429076225 is an frugal number, since it uses more digits than its factorization.

1215429076225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4896 (or 2448 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 46.

The spelling of 1215429076225 in words is "one trillion, two hundred fifteen billion, four hundred twenty-nine million, seventy-six thousand, two hundred twenty-five".