51145969 has 4 divisors (see below), whose sum is σ = 58452544. Its totient is φ = 43839396.

The previous prime is 51145957. The next prime is 51145987. The reversal of 51145969 is 96954115.

51145969 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51145969 - 2⁷ = 51145841 is a prime.

It is a super-2 number, since 2×51145969² = 5231820289897922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51145949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3653277 + ... + 3653290.

It is an arithmetic number, because the mean of its divisors is an integer number (14613136).

Almost surely, 2^51145969 is an apocalyptic number.

It is an amenable number.

51145969 is a deficient number, since it is larger than the sum of its proper divisors (7306575).

51145969 is an equidigital number, since it uses as much as digits as its factorization.

51145969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7306574.

The product of its digits is 48600, while the sum is 40.

The square root of 51145969 is about 7151.6410004977. The cubic root of 51145969 is about 371.1964410865.

The spelling of 51145969 in words is "fifty-one million, one hundred forty-five thousand, nine hundred sixty-nine".