1351379891 has 2 divisors, whose sum is σ = 1351379892. Its totient is φ = 1351379890.

The previous prime is 1351379857. The next prime is 1351379941. The reversal of 1351379891 is 1989731531.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1351379891 - 2¹⁰ = 1351378867 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1351379831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 675689945 + 675689946.

It is an arithmetic number, because the mean of its divisors is an integer number (675689946).

Almost surely, 2^1351379891 is an apocalyptic number.

1351379891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1351379891 is an equidigital number, since it uses as much as digits as its factorization.

1351379891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 47.

The square root of 1351379891 is about 36761.1192838303. The cubic root of 1351379891 is about 1105.5858815071.

It can be divided in two parts, 1351 and 379891, that multiplied together give a triangular number (513232741 = T₃₂₀₃₈).

The spelling of 1351379891 in words is "one billion, three hundred fifty-one million, three hundred seventy-nine thousand, eight hundred ninety-one".