11778631 has 2 divisors, whose sum is σ = 11778632. Its totient is φ = 11778630.

The previous prime is 11778629. The next prime is 11778643. The reversal of 11778631 is 13687711.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11778631 - 2¹ = 11778629 is a prime.

It is a super-2 number, since 2×11778631² = 277472296468322, which contains 22 as substring.

Together with 11778629, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11778661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5889315 + 5889316.

It is an arithmetic number, because the mean of its divisors is an integer number (5889316).

Almost surely, 2^11778631 is an apocalyptic number.

11778631 is a deficient number, since it is larger than the sum of its proper divisors (1).

11778631 is an equidigital number, since it uses as much as digits as its factorization.

11778631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7056, while the sum is 34.

The square root of 11778631 is about 3432.0010198134. The cubic root of 11778631 is about 227.5263005459.

The spelling of 11778631 in words is "eleven million, seven hundred seventy-eight thousand, six hundred thirty-one".