51256969 has 4 divisors (see below), whose sum is σ = 51832980. Its totient is φ = 50680960.

The previous prime is 51256967. The next prime is 51256973. The reversal of 51256969 is 96965215.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24631369 + 26625600 = 4963^2 + 5160^2 .

It is a cyclic number.

It is not a de Polignac number, because 51256969 - 2¹ = 51256967 is a prime.

It is a super-2 number, since 2×51256969² = 5254553742133922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51256967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 287872 + ... + 288049.

It is an arithmetic number, because the mean of its divisors is an integer number (12958245).

Almost surely, 2^51256969 is an apocalyptic number.

It is an amenable number.

51256969 is a deficient number, since it is larger than the sum of its proper divisors (576011).

51256969 is an equidigital number, since it uses as much as digits as its factorization.

51256969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576010.

The product of its digits is 145800, while the sum is 43.

The square root of 51256969 is about 7159.3972511658. The cubic root of 51256969 is about 371.4647778667.

It can be divided in two parts, 5125696 and 9, that multiplied together give a square (46131264 = 6792²).

The spelling of 51256969 in words is "fifty-one million, two hundred fifty-six thousand, nine hundred sixty-nine".