515550149 has 2 divisors, whose sum is σ = 515550150. Its totient is φ = 515550148.

The previous prime is 515550137. The next prime is 515550169. The reversal of 515550149 is 941055515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 515517025 + 33124 = 22705^2 + 182^2 .

It is a cyclic number.

It is not a de Polignac number, because 515550149 - 2²⁰ = 514501573 is a prime.

It is a super-2 number, since 2×515550149² = 531583912267844402, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (515550169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 257775074 + 257775075.

It is an arithmetic number, because the mean of its divisors is an integer number (257775075).

Almost surely, 2^515550149 is an apocalyptic number.

It is an amenable number.

515550149 is a deficient number, since it is larger than the sum of its proper divisors (1).

515550149 is an equidigital number, since it uses as much as digits as its factorization.

515550149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22500, while the sum is 35.

The square root of 515550149 is about 22705.7294311370. The cubic root of 515550149 is about 801.8447786573.

The spelling of 515550149 in words is "five hundred fifteen million, five hundred fifty thousand, one hundred forty-nine".