51396609 has 16 divisors (see below), whose sum is σ = 74891520. Its totient is φ = 31094160.

The previous prime is 51396607. The next prime is 51396617. The reversal of 51396609 is 90669315.

It is not a de Polignac number, because 51396609 - 2¹ = 51396607 is a prime.

It is a super-2 number, since 2×51396609² = 5283222833397762, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51396607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24982 + ... + 26960.

It is an arithmetic number, because the mean of its divisors is an integer number (4680720).

It is a Proth number, since it is equal to 3137 ⋅ 2¹⁴ + 1 and 3137 < 2¹⁴.

Almost surely, 2^51396609 is an apocalyptic number.

It is an amenable number.

51396609 is a deficient number, since it is larger than the sum of its proper divisors (23494911).

51396609 is a wasteful number, since it uses less digits than its factorization.

51396609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2780.

The product of its (nonzero) digits is 43740, while the sum is 39.

The square root of 51396609 is about 7169.1428357929. The cubic root of 51396609 is about 371.8018007091.

The spelling of 51396609 in words is "fifty-one million, three hundred ninety-six thousand, six hundred nine".