1268191263 has 4 divisors (see below), whose sum is σ = 1690921688. Its totient is φ = 845460840.

The previous prime is 1268191231. The next prime is 1268191277. The reversal of 1268191263 is 3621918621.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1268191263 - 2⁵ = 1268191231 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 (1268191063) 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, 211365208 + ... + 211365213.

It is an arithmetic number, because the mean of its divisors is an integer number (422730422).

Almost surely, 2^1268191263 is an apocalyptic number.

1268191263 is a deficient number, since it is larger than the sum of its proper divisors (422730425).

1268191263 is an equidigital number, since it uses as much as digits as its factorization.

1268191263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422730424.

The product of its digits is 31104, while the sum is 39.

The square root of 1268191263 is about 35611.6731283437. The cubic root of 1268191263 is about 1082.4177837417.

The spelling of 1268191263 in words is "one billion, two hundred sixty-eight million, one hundred ninety-one thousand, two hundred sixty-three".