1268156819 has 4 divisors (see below), whose sum is σ = 1323294096. Its totient is φ = 1213019544.

The previous prime is 1268156809. The next prime is 1268156821. The reversal of 1268156819 is 9186518621.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1268156819 - 2²⁴ = 1251379603 is a prime.

It is a super-2 number, since 2×1268156819² = 3216443435152397522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1268156809) 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, 27568604 + ... + 27568649.

It is an arithmetic number, because the mean of its divisors is an integer number (330823524).

Almost surely, 2^1268156819 is an apocalyptic number.

1268156819 is a deficient number, since it is larger than the sum of its proper divisors (55137277).

1268156819 is an equidigital number, since it uses as much as digits as its factorization.

1268156819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55137276.

The product of its digits is 207360, while the sum is 47.

The square root of 1268156819 is about 35611.1895195878. The cubic root of 1268156819 is about 1082.4079841852.

The spelling of 1268156819 in words is "one billion, two hundred sixty-eight million, one hundred fifty-six thousand, eight hundred nineteen".