51121507 has 2 divisors, whose sum is σ = 51121508. Its totient is φ = 51121506.

The previous prime is 51121501. The next prime is 51121513. The reversal of 51121507 is 70512115.

It is a balanced prime because it is at equal distance from previous prime (51121501) and next prime (51121513).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51121507 is a prime.

It is a super-2 number, since 2×51121507² = 5226816955902098, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51121501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25560753 + 25560754.

It is an arithmetic number, because the mean of its divisors is an integer number (25560754).

Almost surely, 2^51121507 is an apocalyptic number.

51121507 is a deficient number, since it is larger than the sum of its proper divisors (1).

51121507 is an equidigital number, since it uses as much as digits as its factorization.

51121507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 350, while the sum is 22.

The square root of 51121507 is about 7149.9305591034. The cubic root of 51121507 is about 371.1372532656.

The spelling of 51121507 in words is "fifty-one million, one hundred twenty-one thousand, five hundred seven".