51026209 has 16 divisors (see below), whose sum is σ = 56730240. Its totient is φ = 45601920.

The previous prime is 51026201. The next prime is 51026237. The reversal of 51026209 is 90262015.

It is not a de Polignac number, because 51026209 - 2³ = 51026201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51026201) 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, 53989 + ... + 54925.

It is an arithmetic number, because the mean of its divisors is an integer number (3545640).

Almost surely, 2^51026209 is an apocalyptic number.

51026209 is a gapful number since it is divisible by the number (59) formed by its first and last digit.

It is an amenable number.

51026209 is a deficient number, since it is larger than the sum of its proper divisors (5704031).

51026209 is a wasteful number, since it uses less digits than its factorization.

51026209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 51026209 is about 7143.2631898874. The cubic root of 51026209 is about 370.9064916921.

It can be divided in two parts, 5102 and 6209, that added together give a palindrome (11311).

The spelling of 51026209 in words is "fifty-one million, twenty-six thousand, two hundred nine".