1261330615 has 16 divisors (see below), whose sum is σ = 1540915200. Its totient is φ = 990889632.

The previous prime is 1261330597. The next prime is 1261330639. The reversal of 1261330615 is 5160331621.

It is a cyclic number.

It is not a de Polignac number, because 1261330615 - 2⁵ = 1261330583 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, 375634 + ... + 378976.

It is an arithmetic number, because the mean of its divisors is an integer number (96307200).

Almost surely, 2^1261330615 is an apocalyptic number.

1261330615 is a deficient number, since it is larger than the sum of its proper divisors (279584585).

1261330615 is a wasteful number, since it uses less digits than its factorization.

1261330615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4686.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 1261330615 is about 35515.2166683522. The cubic root of 1261330615 is about 1080.4623691806.

The spelling of 1261330615 in words is "one billion, two hundred sixty-one million, three hundred thirty thousand, six hundred fifteen".