513490891 has 2 divisors, whose sum is σ = 513490892. Its totient is φ = 513490890.

The previous prime is 513490889. The next prime is 513490897. The reversal of 513490891 is 198094315.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 513490891 - 2¹ = 513490889 is a prime.

Together with 513490889, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (513490897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256745445 + 256745446.

It is an arithmetic number, because the mean of its divisors is an integer number (256745446).

Almost surely, 2^513490891 is an apocalyptic number.

513490891 is a deficient number, since it is larger than the sum of its proper divisors (1).

513490891 is an equidigital number, since it uses as much as digits as its factorization.

513490891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 513490891 is about 22660.3373981942. The cubic root of 513490891 is about 800.7757532446.

The spelling of 513490891 in words is "five hundred thirteen million, four hundred ninety thousand, eight hundred ninety-one".