51739249 has 3 divisors (see below), whose sum is σ = 51746443. Its totient is φ = 51732056.

The previous prime is 51739243. The next prime is 51739267. The reversal of 51739249 is 94293715.

The square root of 51739249 is 7193.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 94293715 = 5 ⋅18858743.

It can be written as a sum of positive squares in only one way, i.e., 3186225 + 48553024 = 1785^2 + 6968^2 .

It is not a de Polignac number, because 51739249 - 2³ = 51739241 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51739241) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 3597 + ... + 10789.

Almost surely, 2^51739249 is an apocalyptic number.

51739249 is the 7193-rd square number.

51739249 is the 3597-th centered octagonal number.

It is an amenable number.

51739249 is a deficient number, since it is larger than the sum of its proper divisors (7194).

51739249 is an frugal number, since it uses more digits than its factorization.

51739249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14386 (or 7193 counting only the distinct ones).

The product of its digits is 68040, while the sum is 40.

The cubic root of 51739249 is about 372.6261878981.

The spelling of 51739249 in words is "fifty-one million, seven hundred thirty-nine thousand, two hundred forty-nine".