1242620065 has 4 divisors (see below), whose sum is σ = 1491144084. Its totient is φ = 994096048.

The previous prime is 1242620059. The next prime is 1242620077. The reversal of 1242620065 is 5600262421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5600262421 = 13 ⋅430789417.

It can be written as a sum of positive squares in 2 ways, for example, as 308950929 + 933669136 = 17577^2 + 30556^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242620065 - 2¹⁷ = 1242488993 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124262002 + ... + 124262011.

It is an arithmetic number, because the mean of its divisors is an integer number (372786021).

Almost surely, 2^1242620065 is an apocalyptic number.

It is an amenable number.

1242620065 is a deficient number, since it is larger than the sum of its proper divisors (248524019).

1242620065 is an equidigital number, since it uses as much as digits as its factorization.

1242620065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248524018.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 1242620065 is about 35250.8165153660. The cubic root of 1242620065 is about 1075.0932141994.

Adding to 1242620065 its reverse (5600262421), we get a palindrome (6842882486).

The spelling of 1242620065 in words is "one billion, two hundred forty-two million, six hundred twenty thousand, sixty-five".