51287061 has 32 divisors (see below), whose sum is σ = 82851840. Its totient is φ = 27566784.

The previous prime is 51287059. The next prime is 51287087. The reversal of 51287061 is 16078215.

It is not a de Polignac number, because 51287061 - 2¹ = 51287059 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51287161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68656 + ... + 69398.

It is an arithmetic number, because the mean of its divisors is an integer number (2589120).

Almost surely, 2^51287061 is an apocalyptic number.

It is an amenable number.

51287061 is a deficient number, since it is larger than the sum of its proper divisors (31564779).

51287061 is a wasteful number, since it uses less digits than its factorization.

51287061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 945.

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 51287061 is about 7161.4985163721. The cubic root of 51287061 is about 371.5374569680.

The spelling of 51287061 in words is "fifty-one million, two hundred eighty-seven thousand, sixty-one".