51479765 has 8 divisors (see below), whose sum is σ = 63445560. Its totient is φ = 40070592.

The previous prime is 51479737. The next prime is 51479767. The reversal of 51479765 is 56797415.

It can be written as a sum of positive squares in 4 ways, for example, as 3066001 + 48413764 = 1751^2 + 6958^2 .

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 51479765 - 2¹⁶ = 51414229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51479767) 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 7 ways as a sum of consecutive naturals, for example, 138950 + ... + 139319.

It is an arithmetic number, because the mean of its divisors is an integer number (7930695).

Almost surely, 2^51479765 is an apocalyptic number.

It is an amenable number.

51479765 is a deficient number, since it is larger than the sum of its proper divisors (11965795).

51479765 is a wasteful number, since it uses less digits than its factorization.

51479765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278311.

The product of its digits is 264600, while the sum is 44.

The square root of 51479765 is about 7174.9400694361. The cubic root of 51479765 is about 372.0022088164.

The spelling of 51479765 in words is "fifty-one million, four hundred seventy-nine thousand, seven hundred sixty-five".