51203969 has 2 divisors, whose sum is σ = 51203970. Its totient is φ = 51203968.

The previous prime is 51203959. The next prime is 51203981. The reversal of 51203969 is 96930215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49210225 + 1993744 = 7015^2 + 1412^2 .

It is a cyclic number.

It is not a de Polignac number, because 51203969 - 2⁴ = 51203953 is a prime.

It is a super-2 number, since 2×51203969² = 5243692882705922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51203939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25601984 + 25601985.

It is an arithmetic number, because the mean of its divisors is an integer number (25601985).

Almost surely, 2^51203969 is an apocalyptic number.

It is an amenable number.

51203969 is a deficient number, since it is larger than the sum of its proper divisors (1).

51203969 is an equidigital number, since it uses as much as digits as its factorization.

51203969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 51203969 is about 7155.6948649310. The cubic root of 51203969 is about 371.3367014755.

The spelling of 51203969 in words is "fifty-one million, two hundred three thousand, nine hundred sixty-nine".