51683949 has 12 divisors (see below), whose sum is σ = 74717500. Its totient is φ = 34426944.

The previous prime is 51683939. The next prime is 51683959. The reversal of 51683949 is 94938615.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51683939) and next prime (51683959).

It can be written as a sum of positive squares in 2 ways, for example, as 25857225 + 25826724 = 5085^2 + 5082^2 .

It is not a de Polignac number, because 51683949 - 2⁵ = 51683917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51683939) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17427 + ... + 20175.

Almost surely, 2^51683949 is an apocalyptic number.

It is an amenable number.

51683949 is a deficient number, since it is larger than the sum of its proper divisors (23033551).

51683949 is a wasteful number, since it uses less digits than its factorization.

51683949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4844 (or 4841 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 51683949 is about 7189.1549572951. The cubic root of 51683949 is about 372.4933836640.

The spelling of 51683949 in words is "fifty-one million, six hundred eighty-three thousand, nine hundred forty-nine".