1351778851 has 4 divisors (see below), whose sum is σ = 1431295272. Its totient is φ = 1272262432.

The previous prime is 1351778843. The next prime is 1351778861. The reversal of 1351778851 is 1588771531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1588771531 = 28411 ⋅55921.

It is a cyclic number.

It is not a de Polignac number, because 1351778851 - 2³ = 1351778843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1351778821) 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, 39758185 + ... + 39758218.

It is an arithmetic number, because the mean of its divisors is an integer number (357823818).

Almost surely, 2^1351778851 is an apocalyptic number.

1351778851 is a deficient number, since it is larger than the sum of its proper divisors (79516421).

1351778851 is an equidigital number, since it uses as much as digits as its factorization.

1351778851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79516420.

The product of its digits is 235200, while the sum is 46.

The square root of 1351778851 is about 36766.5452687630. The cubic root of 1351778851 is about 1105.6946693584.

The spelling of 1351778851 in words is "one billion, three hundred fifty-one million, seven hundred seventy-eight thousand, eight hundred fifty-one".