1263661959 has 32 divisors (see below), whose sum is σ = 2012938240. Its totient is φ = 689925600.

The previous prime is 1263661951. The next prime is 1263661967. The reversal of 1263661959 is 9591663621.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1263661951) and next prime (1263661967).

It is not a de Polignac number, because 1263661959 - 2³ = 1263661951 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 (1263661951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39144 + ... + 63714.

It is an arithmetic number, because the mean of its divisors is an integer number (62904320).

Almost surely, 2^1263661959 is an apocalyptic number.

1263661959 is a deficient number, since it is larger than the sum of its proper divisors (749276281).

1263661959 is a wasteful number, since it uses less digits than its factorization.

1263661959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24691.

The product of its digits is 524880, while the sum is 48.

The square root of 1263661959 is about 35548.0232783765. The cubic root of 1263661959 is about 1081.1276399387.

The spelling of 1263661959 in words is "one billion, two hundred sixty-three million, six hundred sixty-one thousand, nine hundred fifty-nine".