51213571 has 8 divisors (see below), whose sum is σ = 56584224. Its totient is φ = 46104960.

The previous prime is 51213523. The next prime is 51213583. The reversal of 51213571 is 17531215.

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

It is a cyclic number.

It is not a de Polignac number, because 51213571 - 2⁷ = 51213443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51211571) 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, 65100 + ... + 65881.

It is an arithmetic number, because the mean of its divisors is an integer number (7073028).

Almost surely, 2^51213571 is an apocalyptic number.

51213571 is a deficient number, since it is larger than the sum of its proper divisors (5370653).

51213571 is a wasteful number, since it uses less digits than its factorization.

51213571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131021.

The product of its digits is 1050, while the sum is 25.

The square root of 51213571 is about 7156.3657676226. The cubic root of 51213571 is about 371.3599116044.

Adding to 51213571 its reverse (17531215), we get a palindrome (68744786).

The spelling of 51213571 in words is "fifty-one million, two hundred thirteen thousand, five hundred seventy-one".