51209266 has 4 divisors (see below), whose sum is σ = 76813902. Its totient is φ = 25604632.

The previous prime is 51209233. The next prime is 51209299. The reversal of 51209266 is 66290215.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (51209233) and next prime (51209299).

It can be written as a sum of positive squares in only one way, i.e., 28313041 + 22896225 = 5321^2 + 4785^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12802315 + ... + 12802318.

Almost surely, 2^51209266 is an apocalyptic number.

51209266 is a deficient number, since it is larger than the sum of its proper divisors (25604636).

51209266 is a wasteful number, since it uses less digits than its factorization.

51209266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25604635.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 51209266 is about 7156.0649801410. The cubic root of 51209266 is about 371.3495058389.

The spelling of 51209266 in words is "fifty-one million, two hundred nine thousand, two hundred sixty-six".