51138465 has 32 divisors (see below), whose sum is σ = 99014400. Its totient is φ = 22001664.

The previous prime is 51138463. The next prime is 51138467. The reversal of 51138465 is 56483115.

It is an interprime number because it is at equal distance from previous prime (51138463) and next prime (51138467).

It is not a de Polignac number, because 51138465 - 2¹ = 51138463 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51138463) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12540 + ... + 16109.

It is an arithmetic number, because the mean of its divisors is an integer number (3094200).

Almost surely, 2^51138465 is an apocalyptic number.

It is an amenable number.

51138465 is a deficient number, since it is larger than the sum of its proper divisors (47875935).

51138465 is a wasteful number, since it uses less digits than its factorization.

51138465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28681.

The product of its digits is 14400, while the sum is 33.

The square root of 51138465 is about 7151.1163464175. The cubic root of 51138465 is about 371.1782865484.

The spelling of 51138465 in words is "fifty-one million, one hundred thirty-eight thousand, four hundred sixty-five".