51740309 has 4 divisors (see below), whose sum is σ = 52943616. Its totient is φ = 50537004.

The previous prime is 51740303. The next prime is 51740323. The reversal of 51740309 is 90304715.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90304715 = 5 ⋅18060943.

It is a cyclic number.

It is not a de Polignac number, because 51740309 - 2¹² = 51736213 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 (51740303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 601589 + ... + 601674.

It is an arithmetic number, because the mean of its divisors is an integer number (13235904).

Almost surely, 2^51740309 is an apocalyptic number.

It is an amenable number.

51740309 is a deficient number, since it is larger than the sum of its proper divisors (1203307).

51740309 is a wasteful number, since it uses less digits than its factorization.

51740309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1203306.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 51740309 is about 7193.0736823697. The cubic root of 51740309 is about 372.6287325882.

The spelling of 51740309 in words is "fifty-one million, seven hundred forty thousand, three hundred nine".