51511913 has 2 divisors, whose sum is σ = 51511914. Its totient is φ = 51511912.

The previous prime is 51511891. The next prime is 51511931. The reversal of 51511913 is 31911515.

Together with next prime (51511931) 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., 48832144 + 2679769 = 6988^2 + 1637^2 .

It is a cyclic number.

It is not a de Polignac number, because 51511913 - 2⁸ = 51511657 is a prime.

It is not a weakly prime, because it can be changed into another prime (51511963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25755956 + 25755957.

It is an arithmetic number, because the mean of its divisors is an integer number (25755957).

Almost surely, 2^51511913 is an apocalyptic number.

It is an amenable number.

51511913 is a deficient number, since it is larger than the sum of its proper divisors (1).

51511913 is an equidigital number, since it uses as much as digits as its factorization.

51511913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 675, while the sum is 26.

The square root of 51511913 is about 7177.1800172491. The cubic root of 51511913 is about 372.0796284813.

The spelling of 51511913 in words is "fifty-one million, five hundred eleven thousand, nine hundred thirteen".