51949217 has 4 divisors (see below), whose sum is σ = 52091136. Its totient is φ = 51807300.

The previous prime is 51949213. The next prime is 51949243. The reversal of 51949217 is 71294915.

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, and also an emirpimes, since its reverse is a distinct semiprime: 71294915 = 5 ⋅14258983.

It is a cyclic number.

It is not a de Polignac number, because 51949217 - 2² = 51949213 is a prime.

It is a super-2 number, since 2×51949217² = 5397442293826178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51949213) 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, 70409 + ... + 71142.

It is an arithmetic number, because the mean of its divisors is an integer number (13022784).

Almost surely, 2^51949217 is an apocalyptic number.

It is an amenable number.

51949217 is a deficient number, since it is larger than the sum of its proper divisors (141919).

51949217 is a wasteful number, since it uses less digits than its factorization.

51949217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141918.

The product of its digits is 22680, while the sum is 38.

The square root of 51949217 is about 7207.5805233102. The cubic root of 51949217 is about 373.1295709051.

The spelling of 51949217 in words is "fifty-one million, nine hundred forty-nine thousand, two hundred seventeen".