51340309 has 16 divisors (see below), whose sum is σ = 54706176. Its totient is φ = 48106800.

The previous prime is 51340259. The next prime is 51340319. The reversal of 51340309 is 90304315.

It is a cyclic number.

It is not a de Polignac number, because 51340309 - 2⁷ = 51340181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51340319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 243214 + ... + 243424.

It is an arithmetic number, because the mean of its divisors is an integer number (3419136).

Almost surely, 2^51340309 is an apocalyptic number.

It is an amenable number.

51340309 is a deficient number, since it is larger than the sum of its proper divisors (3365867).

51340309 is a wasteful number, since it uses less digits than its factorization.

51340309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 51340309 is about 7165.2152096082. The cubic root of 51340309 is about 371.6659935058.

The spelling of 51340309 in words is "fifty-one million, three hundred forty thousand, three hundred nine".