11742781 has 2 divisors, whose sum is σ = 11742782. Its totient is φ = 11742780.

The previous prime is 11742751. The next prime is 11742793. The reversal of 11742781 is 18724711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9865881 + 1876900 = 3141^2 + 1370^2 .

It is a cyclic number.

It is not a de Polignac number, because 11742781 - 2²³ = 3354173 is a prime.

It is a super-2 number, since 2×11742781² = 275785811227922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11742751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5871390 + 5871391.

It is an arithmetic number, because the mean of its divisors is an integer number (5871391).

Almost surely, 2^11742781 is an apocalyptic number.

11742781 is the 1533-rd centered decagonal number.

It is an amenable number.

11742781 is a deficient number, since it is larger than the sum of its proper divisors (1).

11742781 is an equidigital number, since it uses as much as digits as its factorization.

11742781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3136, while the sum is 31.

The square root of 11742781 is about 3426.7741390410. The cubic root of 11742781 is about 227.2952293405.

The spelling of 11742781 in words is "eleven million, seven hundred forty-two thousand, seven hundred eighty-one".