51275969 has 4 divisors (see below), whose sum is σ = 52661844. Its totient is φ = 49890096.

The previous prime is 51275957. The next prime is 51275981. The reversal of 51275969 is 96957215.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (51275957) and next prime (51275981).

It can be written as a sum of positive squares in 2 ways, for example, as 30691600 + 20584369 = 5540^2 + 4537^2 .

It is a cyclic number.

It is not a de Polignac number, because 51275969 - 2⁸ = 51275713 is a prime.

It is a super-2 number, since 2×51275969² = 5258449993777922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51275069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 692882 + ... + 692955.

It is an arithmetic number, because the mean of its divisors is an integer number (13165461).

Almost surely, 2^51275969 is an apocalyptic number.

It is an amenable number.

51275969 is a deficient number, since it is larger than the sum of its proper divisors (1385875).

51275969 is a wasteful number, since it uses less digits than its factorization.

51275969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1385874.

The product of its digits is 170100, while the sum is 44.

The square root of 51275969 is about 7160.7240555687. The cubic root of 51275969 is about 371.5106705458.

The spelling of 51275969 in words is "fifty-one million, two hundred seventy-five thousand, nine hundred sixty-nine".