51478613 has 2 divisors, whose sum is σ = 51478614. Its totient is φ = 51478612.

The previous prime is 51478607. The next prime is 51478643. The reversal of 51478613 is 31687415.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49885969 + 1592644 = 7063^2 + 1262^2 .

It is a cyclic number.

It is not a de Polignac number, because 51478613 - 2⁴ = 51478597 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51478643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25739306 + 25739307.

It is an arithmetic number, because the mean of its divisors is an integer number (25739307).

Almost surely, 2^51478613 is an apocalyptic number.

It is an amenable number.

51478613 is a deficient number, since it is larger than the sum of its proper divisors (1).

51478613 is an equidigital number, since it uses as much as digits as its factorization.

51478613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 35.

The square root of 51478613 is about 7174.8597895708. The cubic root of 51478613 is about 371.9994339414. Note that the first 3 decimals are identical.

The spelling of 51478613 in words is "fifty-one million, four hundred seventy-eight thousand, six hundred thirteen".