51151109 has 2 divisors, whose sum is σ = 51151110. Its totient is φ = 51151108.

The previous prime is 51151091. The next prime is 51151117. The reversal of 51151109 is 90115115.

Together with previous prime (51151091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42211009 + 8940100 = 6497^2 + 2990^2 .

It is a cyclic number.

It is not a de Polignac number, because 51151109 - 2¹² = 51147013 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51151129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25575554 + 25575555.

It is an arithmetic number, because the mean of its divisors is an integer number (25575555).

Almost surely, 2^51151109 is an apocalyptic number.

It is an amenable number.

51151109 is a deficient number, since it is larger than the sum of its proper divisors (1).

51151109 is an equidigital number, since it uses as much as digits as its factorization.

51151109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 225, while the sum is 23.

The square root of 51151109 is about 7152.0003495526. Note that the first 3 decimals coincide. The cubic root of 51151109 is about 371.2088753397.

The spelling of 51151109 in words is "fifty-one million, one hundred fifty-one thousand, one hundred nine".