1263780041 has 4 divisors (see below), whose sum is σ = 1330294800. Its totient is φ = 1197265284.

The previous prime is 1263779999. The next prime is 1263780043. The reversal of 1263780041 is 1400873621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1400873621 = 7 ⋅200124803.

It is a cyclic number.

It is not a de Polignac number, because 1263780041 - 2⁶ = 1263779977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1263780043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33257351 + ... + 33257388.

It is an arithmetic number, because the mean of its divisors is an integer number (332573700).

Almost surely, 2^1263780041 is an apocalyptic number.

It is an amenable number.

1263780041 is a deficient number, since it is larger than the sum of its proper divisors (66514759).

1263780041 is an equidigital number, since it uses as much as digits as its factorization.

1263780041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66514758.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 1263780041 is about 35549.6841195530. The cubic root of 1263780041 is about 1081.1613139596.

The spelling of 1263780041 in words is "one billion, two hundred sixty-three million, seven hundred eighty thousand, forty-one".