56211989 has 2 divisors, whose sum is σ = 56211990. Its totient is φ = 56211988.

The previous prime is 56211973. The next prime is 56211997. The reversal of 56211989 is 98911265.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48539089 + 7672900 = 6967^2 + 2770^2 .

It is a cyclic number.

It is not a de Polignac number, because 56211989 - 2⁴ = 56211973 is a prime.

It is a super-2 number, since 2×56211989² = 6319575414672242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56211919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28105994 + 28105995.

It is an arithmetic number, because the mean of its divisors is an integer number (28105995).

Almost surely, 2^56211989 is an apocalyptic number.

It is an amenable number.

56211989 is a deficient number, since it is larger than the sum of its proper divisors (1).

56211989 is an equidigital number, since it uses as much as digits as its factorization.

56211989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 41.

The square root of 56211989 is about 7497.4655050890. The cubic root of 56211989 is about 383.0683910073.

The spelling of 56211989 in words is "fifty-six million, two hundred eleven thousand, nine hundred eighty-nine".