11361781 has 2 divisors, whose sum is σ = 11361782. Its totient is φ = 11361780.

The previous prime is 11361773. The next prime is 11361803. The reversal of 11361781 is 18716311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7789681 + 3572100 = 2791^2 + 1890^2 .

It is a cyclic number.

It is not a de Polignac number, because 11361781 - 2³ = 11361773 is a prime.

It is a super-2 number, since 2×11361781² = 258180134983922, 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 (11368781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5680890 + 5680891.

It is an arithmetic number, because the mean of its divisors is an integer number (5680891).

Almost surely, 2^11361781 is an apocalyptic number.

It is an amenable number.

11361781 is a deficient number, since it is larger than the sum of its proper divisors (1).

11361781 is an equidigital number, since it uses as much as digits as its factorization.

11361781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008, while the sum is 28.

The square root of 11361781 is about 3370.7241061825. The cubic root of 11361781 is about 224.8099201243.

The spelling of 11361781 in words is "eleven million, three hundred sixty-one thousand, seven hundred eighty-one".