51261611 has 2 divisors, whose sum is σ = 51261612. Its totient is φ = 51261610.

The previous prime is 51261583. The next prime is 51261629. The reversal of 51261611 is 11616215.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51261611 - 2¹⁸ = 50999467 is a prime.

It is a super-3 number, since 3×51261611³ (a number of 24 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (51261311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25630805 + 25630806.

It is an arithmetic number, because the mean of its divisors is an integer number (25630806).

Almost surely, 2^51261611 is an apocalyptic number.

51261611 is a deficient number, since it is larger than the sum of its proper divisors (1).

51261611 is an equidigital number, since it uses as much as digits as its factorization.

51261611 is an evil number, because the sum of its binary digits is even.

The product of its digits is 360, while the sum is 23.

The square root of 51261611 is about 7159.7214331285. The cubic root of 51261611 is about 371.4759912196.

Adding to 51261611 its reverse (11616215), we get a palindrome (62877826).

The spelling of 51261611 in words is "fifty-one million, two hundred sixty-one thousand, six hundred eleven".