11257781 has 2 divisors, whose sum is σ = 11257782. Its totient is φ = 11257780.

The previous prime is 11257759. The next prime is 11257793. The reversal of 11257781 is 18775211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7474756 + 3783025 = 2734^2 + 1945^2 .

It is a cyclic number.

It is not a de Polignac number, because 11257781 - 2⁶ = 11257717 is a prime.

It is a super-2 number, since 2×11257781² = 253475266087922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11257711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5628890 + 5628891.

It is an arithmetic number, because the mean of its divisors is an integer number (5628891).

Almost surely, 2^11257781 is an apocalyptic number.

It is an amenable number.

11257781 is a deficient number, since it is larger than the sum of its proper divisors (1).

11257781 is an equidigital number, since it uses as much as digits as its factorization.

11257781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3920, while the sum is 32.

The square root of 11257781 is about 3355.2616887510. The cubic root of 11257781 is about 224.1218844008.

The spelling of 11257781 in words is "eleven million, two hundred fifty-seven thousand, seven hundred eighty-one".