1365520243 has 2 divisors, whose sum is σ = 1365520244. Its totient is φ = 1365520242.

The previous prime is 1365520199. The next prime is 1365520279. The reversal of 1365520243 is 3420255631.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1365520243 - 2¹³ = 1365512051 is a prime.

It is not a weakly prime, because it can be changed into another prime (1365520283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 682760121 + 682760122.

It is an arithmetic number, because the mean of its divisors is an integer number (682760122).

Almost surely, 2^1365520243 is an apocalyptic number.

1365520243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1365520243 is an equidigital number, since it uses as much as digits as its factorization.

1365520243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 1365520243 is about 36952.9463372002. The cubic root of 1365520243 is about 1109.4286600592.

Adding to 1365520243 its reverse (3420255631), we get a palindrome (4785775874).

The spelling of 1365520243 in words is "one billion, three hundred sixty-five million, five hundred twenty thousand, two hundred forty-three".