2056611989 has 2 divisors, whose sum is σ = 2056611990. Its totient is φ = 2056611988.

The previous prime is 2056611971. The next prime is 2056612001. The reversal of 2056611989 is 9891166502.

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., 1778055889 + 278556100 = 42167^2 + 16690^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2056611989 is a prime.

It is a super-2 number, since 2×2056611989² = 8459305746597072242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2056619989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1028305994 + 1028305995.

It is an arithmetic number, because the mean of its divisors is an integer number (1028305995).

Almost surely, 2^2056611989 is an apocalyptic number.

It is an amenable number.

2056611989 is a deficient number, since it is larger than the sum of its proper divisors (1).

2056611989 is an equidigital number, since it uses as much as digits as its factorization.

2056611989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 47.

The square root of 2056611989 is about 45349.8841123106. The cubic root of 2056611989 is about 1271.6983888363.

The spelling of 2056611989 in words is "two billion, fifty-six million, six hundred eleven thousand, nine hundred eighty-nine".