1351891069 has 2 divisors, whose sum is σ = 1351891070. Its totient is φ = 1351891068.

The previous prime is 1351891067. The next prime is 1351891141. The reversal of 1351891069 is 9601981531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 803722500 + 548168569 = 28350^2 + 23413^2 .

It is a cyclic number.

It is not a de Polignac number, because 1351891069 - 2¹ = 1351891067 is a prime.

It is a super-2 number, since 2×1351891069² = 3655218924883925522, which contains 22 as substring.

Together with 1351891067, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1351891067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 675945534 + 675945535.

It is an arithmetic number, because the mean of its divisors is an integer number (675945535).

Almost surely, 2^1351891069 is an apocalyptic number.

It is an amenable number.

1351891069 is a deficient number, since it is larger than the sum of its proper divisors (1).

1351891069 is an equidigital number, since it uses as much as digits as its factorization.

1351891069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 43.

The square root of 1351891069 is about 36768.0713255400. The cubic root of 1351891069 is about 1105.7252649476.

The spelling of 1351891069 in words is "one billion, three hundred fifty-one million, eight hundred ninety-one thousand, sixty-nine".