51407649 has 8 divisors (see below), whose sum is σ = 76159520. Its totient is φ = 34271748.

The previous prime is 51407647. The next prime is 51407659. The reversal of 51407649 is 94670415.

51407649 is a `hidden beast` number, since 5 + 1 + 4 + 0 + 7 + 649 = 666.

It is not a de Polignac number, because 51407649 - 2¹ = 51407647 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51407647) 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, 951967 + ... + 952020.

It is an arithmetic number, because the mean of its divisors is an integer number (9519940).

Almost surely, 2^51407649 is an apocalyptic number.

It is an amenable number.

51407649 is a deficient number, since it is larger than the sum of its proper divisors (24751871).

51407649 is a wasteful number, since it uses less digits than its factorization.

51407649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1903996 (or 1903990 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 51407649 is about 7169.9127609755. The cubic root of 51407649 is about 371.8284198325.

The spelling of 51407649 in words is "fifty-one million, four hundred seven thousand, six hundred forty-nine".