513316381 has 2 divisors, whose sum is σ = 513316382. Its totient is φ = 513316380.

The previous prime is 513316373. The next prime is 513316387. The reversal of 513316381 is 183613315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 509179225 + 4137156 = 22565^2 + 2034^2 .

It is a cyclic number.

It is not a de Polignac number, because 513316381 - 2³ = 513316373 is a prime.

It is a super-2 number, since 2×513316381² = 526987414005874322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (513316387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256658190 + 256658191.

It is an arithmetic number, because the mean of its divisors is an integer number (256658191).

Almost surely, 2^513316381 is an apocalyptic number.

It is an amenable number.

513316381 is a deficient number, since it is larger than the sum of its proper divisors (1).

513316381 is an equidigital number, since it uses as much as digits as its factorization.

513316381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 31.

The square root of 513316381 is about 22656.4865104897. The cubic root of 513316381 is about 800.6850283569.

Adding to 513316381 its reverse (183613315), we get a palindrome (696929696).

The spelling of 513316381 in words is "five hundred thirteen million, three hundred sixteen thousand, three hundred eighty-one".