51681011 has 2 divisors, whose sum is σ = 51681012. Its totient is φ = 51681010.

The previous prime is 51680983. The next prime is 51681017. The reversal of 51681011 is 11018615.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51681011 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51681017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25840505 + 25840506.

It is an arithmetic number, because the mean of its divisors is an integer number (25840506).

Almost surely, 2^51681011 is an apocalyptic number.

51681011 is a deficient number, since it is larger than the sum of its proper divisors (1).

51681011 is an equidigital number, since it uses as much as digits as its factorization.

51681011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 23.

The square root of 51681011 is about 7188.9506188317. The cubic root of 51681011 is about 372.4863253392.

Adding to 51681011 its reverse (11018615), we get a palindrome (62699626).

The spelling of 51681011 in words is "fifty-one million, six hundred eighty-one thousand, eleven".