1306249057 has 4 divisors (see below), whose sum is σ = 1306350256. Its totient is φ = 1306147860.

The previous prime is 1306249039. The next prime is 1306249123. The reversal of 1306249057 is 7509426031.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1306249057 - 2¹¹ = 1306247009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1306249157) 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, 27819 + ... + 58192.

It is an arithmetic number, because the mean of its divisors is an integer number (326587564).

Almost surely, 2^1306249057 is an apocalyptic number.

It is an amenable number.

1306249057 is a deficient number, since it is larger than the sum of its proper divisors (101199).

1306249057 is an equidigital number, since it uses as much as digits as its factorization.

1306249057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101198.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 1306249057 is about 36142.0676912653. The cubic root of 1306249057 is about 1093.1388516010.

The spelling of 1306249057 in words is "one billion, three hundred six million, two hundred forty-nine thousand, fifty-seven".