11897861 has 2 divisors, whose sum is σ = 11897862. Its totient is φ = 11897860.

The previous prime is 11897849. The next prime is 11897863. The reversal of 11897861 is 16879811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11600836 + 297025 = 3406^2 + 545^2 .

It is a cyclic number.

It is not a de Polignac number, because 11897861 - 2¹⁸ = 11635717 is a prime.

Together with 11897863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11897863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5948930 + 5948931.

It is an arithmetic number, because the mean of its divisors is an integer number (5948931).

Almost surely, 2^11897861 is an apocalyptic number.

It is an amenable number.

11897861 is a deficient number, since it is larger than the sum of its proper divisors (1).

11897861 is an equidigital number, since it uses as much as digits as its factorization.

11897861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 41.

The square root of 11897861 is about 3449.3276156376. The cubic root of 11897861 is about 228.2914414536.

It can be divided in two parts, 118 and 97861, that added together give a palindrome (97979).

The spelling of 11897861 in words is "eleven million, eight hundred ninety-seven thousand, eight hundred sixty-one".