51506465 has 16 divisors (see below), whose sum is σ = 64590480. Its totient is φ = 39379200.

The previous prime is 51506461. The next prime is 51506471. The reversal of 51506465 is 56460515.

It can be written as a sum of positive squares in 8 ways, for example, as 12967201 + 38539264 = 3601^2 + 6208^2 .

It is not a de Polignac number, because 51506465 - 2² = 51506461 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51506461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12887 + ... + 16403.

It is an arithmetic number, because the mean of its divisors is an integer number (4036905).

Almost surely, 2^51506465 is an apocalyptic number.

It is an amenable number.

51506465 is a deficient number, since it is larger than the sum of its proper divisors (13084015).

51506465 is a wasteful number, since it uses less digits than its factorization.

51506465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3652.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 51506465 is about 7176.8004709620. The cubic root of 51506465 is about 372.0665107307.

The spelling of 51506465 in words is "fifty-one million, five hundred six thousand, four hundred sixty-five".