51947149 has 8 divisors (see below), whose sum is σ = 55191960. Its totient is φ = 48799296.

The previous prime is 51947143. The next prime is 51947167. The reversal of 51947149 is 94174915.

It can be written as a sum of positive squares in 4 ways, for example, as 14822500 + 37124649 = 3850^2 + 6093^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 51947149 - 2⁹ = 51946637 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 (51947143) 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, 23134 + ... + 25279.

It is an arithmetic number, because the mean of its divisors is an integer number (6898995).

Almost surely, 2^51947149 is an apocalyptic number.

It is an amenable number.

51947149 is a deficient number, since it is larger than the sum of its proper divisors (3244811).

51947149 is a wasteful number, since it uses less digits than its factorization.

51947149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48479.

The product of its digits is 45360, while the sum is 40.

The square root of 51947149 is about 7207.4370618133. The cubic root of 51947149 is about 373.1246196454.

The spelling of 51947149 in words is "fifty-one million, nine hundred forty-seven thousand, one hundred forty-nine".