51577221 has 16 divisors (see below), whose sum is σ = 70939008. Its totient is φ = 33312000.

The previous prime is 51577213. The next prime is 51577241. The reversal of 51577221 is 12277515.

It is not a de Polignac number, because 51577221 - 2³ = 51577213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51577241) 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, 17185 + ... + 19961.

It is an arithmetic number, because the mean of its divisors is an integer number (4433688).

Almost surely, 2^51577221 is an apocalyptic number.

It is an amenable number.

51577221 is a deficient number, since it is larger than the sum of its proper divisors (19361787).

51577221 is a wasteful number, since it uses less digits than its factorization.

51577221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2972.

The product of its digits is 4900, while the sum is 30.

The square root of 51577221 is about 7181.7282738906. The cubic root of 51577221 is about 372.2368058080.

The spelling of 51577221 in words is "fifty-one million, five hundred seventy-seven thousand, two hundred twenty-one".