51222653 has 4 divisors (see below), whose sum is σ = 52472028. Its totient is φ = 49973280.

The previous prime is 51222641. The next prime is 51222659. The reversal of 51222653 is 35622215.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35622215 = 5 ⋅7124443.

It can be written as a sum of positive squares in 2 ways, for example, as 2474329 + 48748324 = 1573^2 + 6982^2 .

It is a cyclic number.

It is not a de Polignac number, because 51222653 - 2⁸ = 51222397 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 (51222659) 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, 624626 + ... + 624707.

It is an arithmetic number, because the mean of its divisors is an integer number (13118007).

Almost surely, 2^51222653 is an apocalyptic number.

It is an amenable number.

51222653 is a deficient number, since it is larger than the sum of its proper divisors (1249375).

51222653 is a wasteful number, since it uses less digits than its factorization.

51222653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1249374.

The product of its digits is 3600, while the sum is 26.

The square root of 51222653 is about 7157.0002794467. Note that the first 3 decimals coincide. The cubic root of 51222653 is about 371.3818621102.

Adding to 51222653 its reverse (35622215), we get a palindrome (86844868).

The spelling of 51222653 in words is "fifty-one million, two hundred twenty-two thousand, six hundred fifty-three".