1306323157 has 4 divisors (see below), whose sum is σ = 1363119840. Its totient is φ = 1249526476.

The previous prime is 1306323149. The next prime is 1306323191. The reversal of 1306323157 is 7513236031.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1306323157 - 2³ = 1306323149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1306323257) 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, 28398307 + ... + 28398352.

It is an arithmetic number, because the mean of its divisors is an integer number (340779960).

Almost surely, 2^1306323157 is an apocalyptic number.

It is an amenable number.

1306323157 is a deficient number, since it is larger than the sum of its proper divisors (56796683).

1306323157 is an equidigital number, since it uses as much as digits as its factorization.

1306323157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56796682.

The product of its (nonzero) digits is 11340, while the sum is 31.

The square root of 1306323157 is about 36143.0927979331. The cubic root of 1306323157 is about 1093.1595214870.

Adding to 1306323157 its reverse (7513236031), we get a palindrome (8819559188).

The spelling of 1306323157 in words is "one billion, three hundred six million, three hundred twenty-three thousand, one hundred fifty-seven".