1345103257 has 4 divisors (see below), whose sum is σ = 1424226996. Its totient is φ = 1265979520.

The previous prime is 1345103213. The next prime is 1345103281. The reversal of 1345103257 is 7523015431.

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: 7523015431 = 73847 ⋅101873.

It can be written as a sum of positive squares in 2 ways, for example, as 1181365641 + 163737616 = 34371^2 + 12796^2 .

It is a cyclic number.

It is not a de Polignac number, because 1345103257 - 2²³ = 1336714649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1345143257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39561844 + ... + 39561877.

It is an arithmetic number, because the mean of its divisors is an integer number (356056749).

Almost surely, 2^1345103257 is an apocalyptic number.

1345103257 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1345103257 is a deficient number, since it is larger than the sum of its proper divisors (79123739).

1345103257 is an equidigital number, since it uses as much as digits as its factorization.

1345103257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79123738.

The product of its (nonzero) digits is 12600, while the sum is 31.

The square root of 1345103257 is about 36675.6493739375. The cubic root of 1345103257 is about 1103.8715524898.

Adding to 1345103257 its reverse (7523015431), we get a palindrome (8868118688).

The spelling of 1345103257 in words is "one billion, three hundred forty-five million, one hundred three thousand, two hundred fifty-seven".