51557229 has 20 divisors (see below), whose sum is σ = 77234784. Its totient is φ = 34274664.

The previous prime is 51557221. The next prime is 51557239. The reversal of 51557229 is 92275515.

It is not a de Polignac number, because 51557229 - 2³ = 51557221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51557193 and 51557202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51557221) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 38794 + ... + 40100.

Almost surely, 2^51557229 is an apocalyptic number.

It is an amenable number.

51557229 is a deficient number, since it is larger than the sum of its proper divisors (25677555).

51557229 is a wasteful number, since it uses less digits than its factorization.

51557229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1806 (or 1797 counting only the distinct ones).

The product of its digits is 31500, while the sum is 36.

The square root of 51557229 is about 7180.3362734624. The cubic root of 51557229 is about 372.1887049876.

The spelling of 51557229 in words is "fifty-one million, five hundred fifty-seven thousand, two hundred twenty-nine".