51896249 has 4 divisors (see below), whose sum is σ = 52019940. Its totient is φ = 51772560.

The previous prime is 51896233. The next prime is 51896269. The reversal of 51896249 is 94269815.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94269815 = 5 ⋅18853963.

It can be written as a sum of positive squares in 2 ways, for example, as 13987600 + 37908649 = 3740^2 + 6157^2 .

It is a cyclic number.

It is not a de Polignac number, because 51896249 - 2⁴ = 51896233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51896219) 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, 61214 + ... + 62055.

It is an arithmetic number, because the mean of its divisors is an integer number (13004985).

Almost surely, 2^51896249 is an apocalyptic number.

It is an amenable number.

51896249 is a deficient number, since it is larger than the sum of its proper divisors (123691).

51896249 is a wasteful number, since it uses less digits than its factorization.

51896249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123690.

The product of its digits is 155520, while the sum is 44.

The square root of 51896249 is about 7203.9051215296. The cubic root of 51896249 is about 373.0027120916.

The spelling of 51896249 in words is "fifty-one million, eight hundred ninety-six thousand, two hundred forty-nine".