51023509 has 2 divisors, whose sum is σ = 51023510. Its totient is φ = 51023508.

The previous prime is 51023501. The next prime is 51023519. The reversal of 51023509 is 90532015.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50367409 + 656100 = 7097^2 + 810^2 .

It is a cyclic number.

It is not a de Polignac number, because 51023509 - 2³ = 51023501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51023501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25511754 + 25511755.

It is an arithmetic number, because the mean of its divisors is an integer number (25511755).

Almost surely, 2^51023509 is an apocalyptic number.

It is an amenable number.

51023509 is a deficient number, since it is larger than the sum of its proper divisors (1).

51023509 is an equidigital number, since it uses as much as digits as its factorization.

51023509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 51023509 is about 7143.0741981307. The cubic root of 51023509 is about 370.8999495300.

The spelling of 51023509 in words is "fifty-one million, twenty-three thousand, five hundred nine".