51515249 has 2 divisors, whose sum is σ = 51515250. Its totient is φ = 51515248.

The previous prime is 51515227. The next prime is 51515279. The reversal of 51515249 is 94251515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42706225 + 8809024 = 6535^2 + 2968^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51515249 is a prime.

It is a Chen prime.

It is equal to p_3086492 and since 51515249 and 3086492 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (51515209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25757624 + 25757625.

It is an arithmetic number, because the mean of its divisors is an integer number (25757625).

Almost surely, 2^51515249 is an apocalyptic number.

It is an amenable number.

51515249 is a deficient number, since it is larger than the sum of its proper divisors (1).

51515249 is an equidigital number, since it uses as much as digits as its factorization.

51515249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9000, while the sum is 32.

The square root of 51515249 is about 7177.4124167418. The cubic root of 51515249 is about 372.0876604800.

The spelling of 51515249 in words is "fifty-one million, five hundred fifteen thousand, two hundred forty-nine".