1311040249 has 2 divisors, whose sum is σ = 1311040250. Its totient is φ = 1311040248.

The previous prime is 1311040219. The next prime is 1311040253. The reversal of 1311040249 is 9420401131.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1002862224 + 308178025 = 31668^2 + 17555^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311040249 - 2⁵ = 1311040217 is a prime.

It is not a weakly prime, because it can be changed into another prime (1311040219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655520124 + 655520125.

It is an arithmetic number, because the mean of its divisors is an integer number (655520125).

Almost surely, 2^1311040249 is an apocalyptic number.

It is an amenable number.

1311040249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311040249 is an equidigital number, since it uses as much as digits as its factorization.

1311040249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1311040249 is about 36208.2897828660. The cubic root of 1311040249 is about 1094.4737291630.

The spelling of 1311040249 in words is "one billion, three hundred eleven million, forty thousand, two hundred forty-nine".