51049969 has 2 divisors, whose sum is σ = 51049970. Its totient is φ = 51049968.

The previous prime is 51049967. The next prime is 51049981. The reversal of 51049969 is 96994015.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37271025 + 13778944 = 6105^2 + 3712^2 .

It is a cyclic number.

It is not a de Polignac number, because 51049969 - 2¹ = 51049967 is a prime.

It is a super-2 number, since 2×51049969² = 5212198669801922, which contains 22 as substring.

Together with 51049967, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51049967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25524984 + 25524985.

It is an arithmetic number, because the mean of its divisors is an integer number (25524985).

Almost surely, 2^51049969 is an apocalyptic number.

It is an amenable number.

51049969 is a deficient number, since it is larger than the sum of its proper divisors (1).

51049969 is an equidigital number, since it uses as much as digits as its factorization.

51049969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 87480, while the sum is 43.

The square root of 51049969 is about 7144.9261017872. The cubic root of 51049969 is about 370.9640527697.

The spelling of 51049969 in words is "fifty-one million, forty-nine thousand, nine hundred sixty-nine".