1351486813 has 4 divisors (see below), whose sum is σ = 1384449948. Its totient is φ = 1318523680.

The previous prime is 1351486811. The next prime is 1351486823. The reversal of 1351486813 is 3186841531.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3186841531 = 811 ⋅3929521.

It can be written as a sum of positive squares in 2 ways, for example, as 224340484 + 1127146329 = 14978^2 + 33573^2 .

It is a cyclic number.

It is not a de Polignac number, because 1351486813 - 2¹ = 1351486811 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1351486811) 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, 16481506 + ... + 16481587.

It is an arithmetic number, because the mean of its divisors is an integer number (346112487).

Almost surely, 2^1351486813 is an apocalyptic number.

It is an amenable number.

1351486813 is a deficient number, since it is larger than the sum of its proper divisors (32963135).

1351486813 is an equidigital number, since it uses as much as digits as its factorization.

1351486813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32963134.

The product of its digits is 69120, while the sum is 40.

The square root of 1351486813 is about 36762.5735361386. The cubic root of 1351486813 is about 1105.6150389475.

The spelling of 1351486813 in words is "one billion, three hundred fifty-one million, four hundred eighty-six thousand, eight hundred thirteen".