11855531 has 2 divisors, whose sum is σ = 11855532. Its totient is φ = 11855530.

The previous prime is 11855521. The next prime is 11855549. The reversal of 11855531 is 13555811.

It is a weak prime.

It is an emirp because it is prime and its reverse (13555811) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11855531 is a prime.

It is a super-2 number, since 2×11855531² = 281107230583922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 11855494 and 11855503.

It is not a weakly prime, because it can be changed into another prime (11855521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5927765 + 5927766.

It is an arithmetic number, because the mean of its divisors is an integer number (5927766).

Almost surely, 2^11855531 is an apocalyptic number.

11855531 is a deficient number, since it is larger than the sum of its proper divisors (1).

11855531 is an equidigital number, since it uses as much as digits as its factorization.

11855531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3000, while the sum is 29.

The square root of 11855531 is about 3443.1861698142. The cubic root of 11855531 is about 228.0203826551.

The spelling of 11855531 in words is "eleven million, eight hundred fifty-five thousand, five hundred thirty-one".