1265530215 has 16 divisors (see below), whose sum is σ = 2029556736. Its totient is φ = 673380000.

The previous prime is 1265530193. The next prime is 1265530223. The reversal of 1265530215 is 5120355621.

It is a happy number.

It is not a de Polignac number, because 1265530215 - 2⁵ = 1265530183 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91411 + ... + 104340.

It is an arithmetic number, because the mean of its divisors is an integer number (126847296).

Almost surely, 2^1265530215 is an apocalyptic number.

1265530215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1265530215 is a deficient number, since it is larger than the sum of its proper divisors (764026521).

1265530215 is a wasteful number, since it uses less digits than its factorization.

1265530215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196190.

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 1265530215 is about 35574.2914897823. The cubic root of 1265530215 is about 1081.6601738711.

Adding to 1265530215 its reverse (5120355621), we get a palindrome (6385885836).

The spelling of 1265530215 in words is "one billion, two hundred sixty-five million, five hundred thirty thousand, two hundred fifteen".