515372989 has 2 divisors, whose sum is σ = 515372990. Its totient is φ = 515372988.

The previous prime is 515372987. The next prime is 515373013. The reversal of 515372989 is 989273515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 386436964 + 128936025 = 19658^2 + 11355^2 .

It is a cyclic number.

It is not a de Polignac number, because 515372989 - 2¹ = 515372987 is a prime.

Together with 515372987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (515372987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 257686494 + 257686495.

It is an arithmetic number, because the mean of its divisors is an integer number (257686495).

Almost surely, 2^515372989 is an apocalyptic number.

It is an amenable number.

515372989 is a deficient number, since it is larger than the sum of its proper divisors (1).

515372989 is an equidigital number, since it uses as much as digits as its factorization.

515372989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 680400, while the sum is 49.

The square root of 515372989 is about 22701.8278779485. The cubic root of 515372989 is about 801.7529213821.

The spelling of 515372989 in words is "five hundred fifteen million, three hundred seventy-two thousand, nine hundred eighty-nine".