1263690649 has 8 divisors (see below), whose sum is σ = 1361265920. Its totient is φ = 1166168016.

The previous prime is 1263690641. The next prime is 1263690661. The reversal of 1263690649 is 9460963621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1263690649 - 2³ = 1263690641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1263690599 and 1263690608.

It is not an unprimeable number, because it can be changed into a prime (1263690641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46882 + ... + 68740.

It is an arithmetic number, because the mean of its divisors is an integer number (170158240).

Almost surely, 2^1263690649 is an apocalyptic number.

It is an amenable number.

1263690649 is a deficient number, since it is larger than the sum of its proper divisors (97575271).

1263690649 is a wasteful number, since it uses less digits than its factorization.

1263690649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26319.

The product of its (nonzero) digits is 419904, while the sum is 46.

The square root of 1263690649 is about 35548.4268146988. The cubic root of 1263690649 is about 1081.1358217991.

It can be divided in two parts, 12636 and 90649, that added together give a triangular number (103285 = T₄₅₄).

The spelling of 1263690649 in words is "one billion, two hundred sixty-three million, six hundred ninety thousand, six hundred forty-nine".