11621989 has 2 divisors, whose sum is σ = 11621990. Its totient is φ = 11621988.

The previous prime is 11621957. The next prime is 11622001. The reversal of 11621989 is 98912611.

11621989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11189025 + 432964 = 3345^2 + 658^2 .

It is a cyclic number.

It is not a de Polignac number, because 11621989 - 2⁵ = 11621957 is a prime.

It is a super-2 number, since 2×11621989² = 270141256632242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11627989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5810994 + 5810995.

It is an arithmetic number, because the mean of its divisors is an integer number (5810995).

Almost surely, 2^11621989 is an apocalyptic number.

It is an amenable number.

11621989 is a deficient number, since it is larger than the sum of its proper divisors (1).

11621989 is an equidigital number, since it uses as much as digits as its factorization.

11621989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 37.

The square root of 11621989 is about 3409.1038411876. The cubic root of 11621989 is about 226.5131849764.

The spelling of 11621989 in words is "eleven million, six hundred twenty-one thousand, nine hundred eighty-nine".