11630781 has 6 divisors (see below), whose sum is σ = 16800030. Its totient is φ = 7753848.

The previous prime is 11630779. The next prime is 11630789. The reversal of 11630781 is 18703611.

It can be written as a sum of positive squares in only one way, i.e., 7650756 + 3980025 = 2766^2 + 1995^2 .

It is not a de Polignac number, because 11630781 - 2¹ = 11630779 is a prime.

It is a super-2 number, since 2×11630781² = 270550133339922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11630789) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 646146 + ... + 646163.

It is an arithmetic number, because the mean of its divisors is an integer number (2800005).

Almost surely, 2^11630781 is an apocalyptic number.

It is an amenable number.

11630781 is a deficient number, since it is larger than the sum of its proper divisors (5169249).

11630781 is a wasteful number, since it uses less digits than its factorization.

11630781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1292315 (or 1292312 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 11630781 is about 3410.3930858480. The cubic root of 11630781 is about 226.5702894286.

The spelling of 11630781 in words is "eleven million, six hundred thirty thousand, seven hundred eighty-one".