51096221 has 4 divisors (see below), whose sum is σ = 55741344. Its totient is φ = 46451100.

The previous prime is 51096193. The next prime is 51096233. The reversal of 51096221 is 12269015.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51096221 is a prime.

It is a super-2 number, since 2×51096221² = 5221647600961682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51036221) 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, 2322545 + ... + 2322566.

It is an arithmetic number, because the mean of its divisors is an integer number (13935336).

Almost surely, 2^51096221 is an apocalyptic number.

It is an amenable number.

51096221 is a deficient number, since it is larger than the sum of its proper divisors (4645123).

51096221 is a wasteful number, since it uses less digits than its factorization.

51096221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4645122.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 51096221 is about 7148.1620714698. The cubic root of 51096221 is about 371.0760518598.

The spelling of 51096221 in words is "fifty-one million, ninety-six thousand, two hundred twenty-one".