51521111 has 2 divisors, whose sum is σ = 51521112. Its totient is φ = 51521110.

The previous prime is 51521089. The next prime is 51521117. The reversal of 51521111 is 11112515.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51521111 - 2¹⁴ = 51504727 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51521111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51521117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25760555 + 25760556.

It is an arithmetic number, because the mean of its divisors is an integer number (25760556).

Almost surely, 2^51521111 is an apocalyptic number.

51521111 is a deficient number, since it is larger than the sum of its proper divisors (1).

51521111 is an equidigital number, since it uses as much as digits as its factorization.

51521111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50, while the sum is 17.

The square root of 51521111 is about 7177.8207695651. The cubic root of 51521111 is about 372.1017734218.

Adding to 51521111 its reverse (11112515), we get a palindrome (62633626).

The spelling of 51521111 in words is "fifty-one million, five hundred twenty-one thousand, one hundred eleven".