11778731 has 2 divisors, whose sum is σ = 11778732. Its totient is φ = 11778730.

The previous prime is 11778719. The next prime is 11778733. The reversal of 11778731 is 13787711.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11778731 - 2¹⁰ = 11777707 is a prime.

It is a super-2 number, since 2×11778731² = 277477007940722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 11778733, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 11778691 and 11778700.

It is not a weakly prime, because it can be changed into another prime (11778733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5889365 + 5889366.

It is an arithmetic number, because the mean of its divisors is an integer number (5889366).

Almost surely, 2^11778731 is an apocalyptic number.

11778731 is a deficient number, since it is larger than the sum of its proper divisors (1).

11778731 is an equidigital number, since it uses as much as digits as its factorization.

11778731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8232, while the sum is 35.

The square root of 11778731 is about 3432.0155885427. The cubic root of 11778731 is about 227.5269444398.

The spelling of 11778731 in words is "eleven million, seven hundred seventy-eight thousand, seven hundred thirty-one".