51122661 has 4 divisors (see below), whose sum is σ = 68163552. Its totient is φ = 34081772.

The previous prime is 51122651. The next prime is 51122663. The reversal of 51122661 is 16622115.

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.

It is a cyclic number.

It is not a de Polignac number, because 51122661 - 2¹⁴ = 51106277 is a prime.

It is a super-2 number, since 2×51122661² = 5227052935441842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51122663) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 8520441 + ... + 8520446.

It is an arithmetic number, because the mean of its divisors is an integer number (17040888).

Almost surely, 2^51122661 is an apocalyptic number.

It is an amenable number.

51122661 is a deficient number, since it is larger than the sum of its proper divisors (17040891).

51122661 is a wasteful number, since it uses less digits than its factorization.

51122661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17040890.

The product of its digits is 720, while the sum is 24.

The square root of 51122661 is about 7150.0112587324. The cubic root of 51122661 is about 371.1400458879.

Adding to 51122661 its reverse (16622115), we get a palindrome (67744776).

The spelling of 51122661 in words is "fifty-one million, one hundred twenty-two thousand, six hundred sixty-one".