51222777 has 8 divisors (see below), whose sum is σ = 68598816. Its totient is φ = 33997632.

The previous prime is 51222767. The next prime is 51222811. The reversal of 51222777 is 77722215.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51222777 - 2¹⁹ = 50698489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51222707) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36928 + ... + 38289.

It is an arithmetic number, because the mean of its divisors is an integer number (8574852).

Almost surely, 2^51222777 is an apocalyptic number.

It is an amenable number.

51222777 is a deficient number, since it is larger than the sum of its proper divisors (17376039).

51222777 is a wasteful number, since it uses less digits than its factorization.

51222777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75447.

The product of its digits is 13720, while the sum is 33.

The square root of 51222777 is about 7157.0089422887. The cubic root of 51222777 is about 371.3821617909.

The spelling of 51222777 in words is "fifty-one million, two hundred twenty-two thousand, seven hundred seventy-seven".