1263958649 has 8 divisors (see below), whose sum is σ = 1314120000. Its totient is φ = 1214235792.

The previous prime is 1263958627. The next prime is 1263958651. The reversal of 1263958649 is 9468593621.

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

It is a cyclic number.

It is not a de Polignac number, because 1263958649 - 2⁸ = 1263958393 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1263958649.

It is not an unprimeable number, because it can be changed into a prime (1263958249) 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, 103739 + ... + 115280.

It is an arithmetic number, because the mean of its divisors is an integer number (164265000).

Almost surely, 2^1263958649 is an apocalyptic number.

It is an amenable number.

1263958649 is a deficient number, since it is larger than the sum of its proper divisors (50161351).

1263958649 is a wasteful number, since it uses less digits than its factorization.

1263958649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219247.

The product of its digits is 2799360, while the sum is 53.

The square root of 1263958649 is about 35552.1961206337. The cubic root of 1263958649 is about 1081.2122444901.

The spelling of 1263958649 in words is "one billion, two hundred sixty-three million, nine hundred fifty-eight thousand, six hundred forty-nine".