1263243557 has 8 divisors (see below), whose sum is σ = 1331465760. Its totient is φ = 1195194960.

The previous prime is 1263243547. The next prime is 1263243563. The reversal of 1263243557 is 7553423621.

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 1263243557 - 2¹⁸ = 1262981413 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 1263243557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1263243517) 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, 28319 + ... + 57692.

It is an arithmetic number, because the mean of its divisors is an integer number (166433220).

Almost surely, 2^1263243557 is an apocalyptic number.

It is an amenable number.

1263243557 is a deficient number, since it is larger than the sum of its proper divisors (68222203).

1263243557 is an equidigital number, since it uses as much as digits as its factorization.

1263243557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86803.

The product of its digits is 151200, while the sum is 38.

The square root of 1263243557 is about 35542.1377663190. The cubic root of 1263243557 is about 1081.0083053078.

The spelling of 1263243557 in words is "one billion, two hundred sixty-three million, two hundred forty-three thousand, five hundred fifty-seven".