1242281265 has 16 divisors (see below), whose sum is σ = 2056190400. Its totient is φ = 639703232.

The previous prime is 1242281251. The next prime is 1242281269. The reversal of 1242281265 is 5621822421.

It is a cyclic number.

It is not a de Polignac number, because 1242281265 - 2¹¹ = 1242279217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1242281269) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1427475 + ... + 1428344.

It is an arithmetic number, because the mean of its divisors is an integer number (128511900).

Almost surely, 2^1242281265 is an apocalyptic number.

1242281265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1242281265 is a deficient number, since it is larger than the sum of its proper divisors (813909135).

1242281265 is a wasteful number, since it uses less digits than its factorization.

1242281265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2855856.

The product of its digits is 15360, while the sum is 33.

The square root of 1242281265 is about 35246.0106253176. The cubic root of 1242281265 is about 1074.9954973671.

The spelling of 1242281265 in words is "one billion, two hundred forty-two million, two hundred eighty-one thousand, two hundred sixty-five".