513994237 has 2 divisors, whose sum is σ = 513994238. Its totient is φ = 513994236.

The previous prime is 513994211. The next prime is 513994259. The reversal of 513994237 is 732499315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 486599481 + 27394756 = 22059^2 + 5234^2 .

It is a cyclic number.

It is not a de Polignac number, because 513994237 - 2⁷ = 513994109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 513994193 and 513994202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (513994037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256997118 + 256997119.

It is an arithmetic number, because the mean of its divisors is an integer number (256997119).

Almost surely, 2^513994237 is an apocalyptic number.

It is an amenable number.

513994237 is a deficient number, since it is larger than the sum of its proper divisors (1).

513994237 is an equidigital number, since it uses as much as digits as its factorization.

513994237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204120, while the sum is 43.

The square root of 513994237 is about 22671.4409996365. The cubic root of 513994237 is about 801.0373194832.

The spelling of 513994237 in words is "five hundred thirteen million, nine hundred ninety-four thousand, two hundred thirty-seven".