51121565 has 8 divisors (see below), whose sum is σ = 66922848. Its totient is φ = 37179280.

The previous prime is 51121561. The next prime is 51121579. The reversal of 51121565 is 56512115.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51121565 - 2² = 51121561 is a prime.

It is a super-2 number, since 2×51121565² = 5226828816098450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51121561) 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, 464687 + ... + 464796.

It is an arithmetic number, because the mean of its divisors is an integer number (8365356).

Almost surely, 2^51121565 is an apocalyptic number.

51121565 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51121565 is a deficient number, since it is larger than the sum of its proper divisors (15801283).

51121565 is a wasteful number, since it uses less digits than its factorization.

51121565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 929499.

The product of its digits is 1500, while the sum is 26.

The square root of 51121565 is about 7149.9346150857. The cubic root of 51121565 is about 371.1373936237.

The spelling of 51121565 in words is "fifty-one million, one hundred twenty-one thousand, five hundred sixty-five".