51151649 has 4 divisors (see below), whose sum is σ = 52534164. Its totient is φ = 49769136.

The previous prime is 51151613. The next prime is 51151687. The reversal of 51151649 is 94615115.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47886400 + 3265249 = 6920^2 + 1807^2 .

It is a cyclic number.

It is not a de Polignac number, because 51151649 - 2¹² = 51147553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51151049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 691202 + ... + 691275.

It is an arithmetic number, because the mean of its divisors is an integer number (13133541).

Almost surely, 2^51151649 is an apocalyptic number.

It is an amenable number.

51151649 is a deficient number, since it is larger than the sum of its proper divisors (1382515).

51151649 is a wasteful number, since it uses less digits than its factorization.

51151649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1382514.

The product of its digits is 5400, while the sum is 32.

The square root of 51151649 is about 7152.0381011289. The cubic root of 51151649 is about 371.2101816137.

The spelling of 51151649 in words is "fifty-one million, one hundred fifty-one thousand, six hundred forty-nine".