51156065 has 8 divisors (see below), whose sum is σ = 61433640. Its totient is φ = 40893952.

The previous prime is 51156023. The next prime is 51156067. The reversal of 51156065 is 56065115.

It can be written as a sum of positive squares in 4 ways, for example, as 30426256 + 20729809 = 5516^2 + 4553^2 .

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 51156065 - 2¹⁴ = 51139681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51156067) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5471 + ... + 11499.

It is an arithmetic number, because the mean of its divisors is an integer number (7679205).

Almost surely, 2^51156065 is an apocalyptic number.

It is an amenable number.

51156065 is a deficient number, since it is larger than the sum of its proper divisors (10277575).

51156065 is a wasteful number, since it uses less digits than its factorization.

51156065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7731.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 51156065 is about 7152.3468176536. The cubic root of 51156065 is about 371.2208636870.

The spelling of 51156065 in words is "fifty-one million, one hundred fifty-six thousand, sixty-five".