56643011 has 2 divisors, whose sum is σ = 56643012. Its totient is φ = 56643010.

The previous prime is 56642947. The next prime is 56643023. The reversal of 56643011 is 11034665.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56643011 - 2⁶ = 56642947 is a prime.

It is a super-2 number, since 2×56643011² = 6416861390292242, which contains 22 as substring.

It is a Sophie Germain prime.

It is equal to p_3374351 and since 56643011 and 3374351 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 (56643311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28321505 + 28321506.

It is an arithmetic number, because the mean of its divisors is an integer number (28321506).

Almost surely, 2^56643011 is an apocalyptic number.

56643011 is a deficient number, since it is larger than the sum of its proper divisors (1).

56643011 is an equidigital number, since it uses as much as digits as its factorization.

56643011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 56643011 is about 7526.1551272878. The cubic root of 56643011 is about 384.0449957220.

Adding to 56643011 its reverse (11034665), we get a palindrome (67677676).

The spelling of 56643011 in words is "fifty-six million, six hundred forty-three thousand, eleven".