1261364063 has 4 divisors (see below), whose sum is σ = 1265420208. Its totient is φ = 1257307920.

The previous prime is 1261364047. The next prime is 1261364099. The reversal of 1261364063 is 3604631621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3604631621 = 293 ⋅12302497.

It is a cyclic number.

It is not a de Polignac number, because 1261364063 - 2⁴ = 1261364047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261364033) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2027606 + ... + 2028227.

It is an arithmetic number, because the mean of its divisors is an integer number (316355052).

Almost surely, 2^1261364063 is an apocalyptic number.

1261364063 is a deficient number, since it is larger than the sum of its proper divisors (4056145).

1261364063 is an equidigital number, since it uses as much as digits as its factorization.

1261364063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4056144.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 1261364063 is about 35515.6875619775. The cubic root of 1261364063 is about 1080.4719196732.

Adding to 1261364063 its reverse (3604631621), we get a palindrome (4865995684).

The spelling of 1261364063 in words is "one billion, two hundred sixty-one million, three hundred sixty-four thousand, sixty-three".