51307969 has 2 divisors, whose sum is σ = 51307970. Its totient is φ = 51307968.

The previous prime is 51307967. The next prime is 51307981. The reversal of 51307969 is 96970315.

51307969 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50126400 + 1181569 = 7080^2 + 1087^2 .

It is a cyclic number.

It is not a de Polignac number, because 51307969 - 2¹ = 51307967 is a prime.

It is a super-2 number, since 2×51307969² = 5265015365809922, which contains 22 as substring.

Together with 51307967, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51307967) 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 as a sum of consecutive naturals, namely, 25653984 + 25653985.

It is an arithmetic number, because the mean of its divisors is an integer number (25653985).

Almost surely, 2^51307969 is an apocalyptic number.

It is an amenable number.

51307969 is a deficient number, since it is larger than the sum of its proper divisors (1).

51307969 is an equidigital number, since it uses as much as digits as its factorization.

51307969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51030, while the sum is 40.

The square root of 51307969 is about 7162.9581179845. The cubic root of 51307969 is about 371.5879378601.

It can be divided in two parts, 5130796 and 9, that multiplied together give a palindrome (46177164).

The spelling of 51307969 in words is "fifty-one million, three hundred seven thousand, nine hundred sixty-nine".