51415913 has 2 divisors, whose sum is σ = 51415914. Its totient is φ = 51415912.

The previous prime is 51415907. The next prime is 51415921. The reversal of 51415913 is 31951415.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29997529 + 21418384 = 5477^2 + 4628^2 .

It is a cyclic number.

It is not a de Polignac number, because 51415913 - 2⁸ = 51415657 is a prime.

It is a super-2 number, since 2×51415913² = 5287192219247138, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51415993) 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, 25707956 + 25707957.

It is an arithmetic number, because the mean of its divisors is an integer number (25707957).

Almost surely, 2^51415913 is an apocalyptic number.

It is an amenable number.

51415913 is a deficient number, since it is larger than the sum of its proper divisors (1).

51415913 is an equidigital number, since it uses as much as digits as its factorization.

51415913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2700, while the sum is 29.

The square root of 51415913 is about 7170.4890349264. The cubic root of 51415913 is about 371.8483431025.

The spelling of 51415913 in words is "fifty-one million, four hundred fifteen thousand, nine hundred thirteen".