51011865 has 24 divisors (see below), whose sum is σ = 93075840. Its totient is φ = 25773984.

The previous prime is 51011839. The next prime is 51011869. The reversal of 51011865 is 56811015.

It is not a de Polignac number, because 51011865 - 2¹¹ = 51009817 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51011869) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28977 + ... + 30686.

It is an arithmetic number, because the mean of its divisors is an integer number (3878160).

Almost surely, 2^51011865 is an apocalyptic number.

It is an amenable number.

51011865 is a deficient number, since it is larger than the sum of its proper divisors (42063975).

51011865 is a wasteful number, since it uses less digits than its factorization.

51011865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59693 (or 59690 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 27.

The square root of 51011865 is about 7142.2590963924. The cubic root of 51011865 is about 370.8717332060.

The spelling of 51011865 in words is "fifty-one million, eleven thousand, eight hundred sixty-five".