51731449 has 8 divisors (see below), whose sum is σ = 64496448. Its totient is φ = 40310160.

The previous prime is 51731411. The next prime is 51731497. The reversal of 51731449 is 94413715.

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

It is not a de Polignac number, because 51731449 - 2¹³ = 51723257 is a prime.

It is a super-2 number, since 2×51731449² = 5352285631279202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51731249) 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, 335842 + ... + 335995.

It is an arithmetic number, because the mean of its divisors is an integer number (8062056).

Almost surely, 2^51731449 is an apocalyptic number.

It is an amenable number.

51731449 is a deficient number, since it is larger than the sum of its proper divisors (12764999).

51731449 is a wasteful number, since it uses less digits than its factorization.

51731449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671855.

The product of its digits is 15120, while the sum is 34.

The square root of 51731449 is about 7192.4577857642. The cubic root of 51731449 is about 372.6074617512.

The spelling of 51731449 in words is "fifty-one million, seven hundred thirty-one thousand, four hundred forty-nine".