51515953 has 2 divisors, whose sum is σ = 51515954. Its totient is φ = 51515952.

The previous prime is 51515941. The next prime is 51515963. The reversal of 51515953 is 35951515.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33732864 + 17783089 = 5808^2 + 4217^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51515953 is a prime.

It is not a weakly prime, because it can be changed into another prime (51515923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25757976 + 25757977.

It is an arithmetic number, because the mean of its divisors is an integer number (25757977).

Almost surely, 2^51515953 is an apocalyptic number.

It is an amenable number.

51515953 is a deficient number, since it is larger than the sum of its proper divisors (1).

51515953 is an equidigital number, since it uses as much as digits as its factorization.

51515953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16875, while the sum is 34.

The square root of 51515953 is about 7177.4614593183. The cubic root of 51515953 is about 372.0893554378.

The spelling of 51515953 in words is "fifty-one million, five hundred fifteen thousand, nine hundred fifty-three".