1306216525 has 12 divisors (see below), whose sum is σ = 1620324244. Its totient is φ = 1044576000.

The previous prime is 1306216507. The next prime is 1306216603. The reversal of 1306216525 is 5256126031.

It can be written as a sum of positive squares in 6 ways, for example, as 54967396 + 1251249129 = 7414^2 + 35373^2 .

It is not a de Polignac number, because 1306216525 - 2⁹ = 1306216013 is a prime.

It is a super-2 number, since 2×1306216525² = 3412403220366151250, which contains 22 as substring.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69655 + ... + 86395.

Almost surely, 2^1306216525 is an apocalyptic number.

It is an amenable number.

1306216525 is a deficient number, since it is larger than the sum of its proper divisors (314107719).

1306216525 is a wasteful number, since it uses less digits than its factorization.

1306216525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19872 (or 19867 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 1306216525 is about 36141.6176312018. The cubic root of 1306216525 is about 1093.1297766884.

The spelling of 1306216525 in words is "one billion, three hundred six million, two hundred sixteen thousand, five hundred twenty-five".