11815457 has 2 divisors, whose sum is σ = 11815458. Its totient is φ = 11815456.

The previous prime is 11815429. The next prime is 11815481. The reversal of 11815457 is 75451811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9096256 + 2719201 = 3016^2 + 1649^2 .

It is an emirp because it is prime and its reverse (75451811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11815457 - 2¹² = 11811361 is a prime.

It is not a weakly prime, because it can be changed into another prime (11815487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5907728 + 5907729.

It is an arithmetic number, because the mean of its divisors is an integer number (5907729).

Almost surely, 2^11815457 is an apocalyptic number.

It is an amenable number.

11815457 is a deficient number, since it is larger than the sum of its proper divisors (1).

11815457 is an equidigital number, since it uses as much as digits as its factorization.

11815457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5600, while the sum is 32.

The square root of 11815457 is about 3437.3619244997. The cubic root of 11815457 is about 227.7631748895.

The spelling of 11815457 in words is "eleven million, eight hundred fifteen thousand, four hundred fifty-seven".