11858921 has 2 divisors, whose sum is σ = 11858922. Its totient is φ = 11858920.

The previous prime is 11858897. The next prime is 11858947. The reversal of 11858921 is 12985811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7778521 + 4080400 = 2789^2 + 2020^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11858921 is a prime.

It is a Chen prime.

It is equal to p₇₇₉₃₆₃ and since 11858921 and 779363 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (11858971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5929460 + 5929461.

It is an arithmetic number, because the mean of its divisors is an integer number (5929461).

Almost surely, 2^11858921 is an apocalyptic number.

It is an amenable number.

11858921 is a deficient number, since it is larger than the sum of its proper divisors (1).

11858921 is an equidigital number, since it uses as much as digits as its factorization.

11858921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 35.

The square root of 11858921 is about 3443.6784112341. The cubic root of 11858921 is about 228.0421141555.

The spelling of 11858921 in words is "eleven million, eight hundred fifty-eight thousand, nine hundred twenty-one".