513213971 has 2 divisors, whose sum is σ = 513213972. Its totient is φ = 513213970.

The previous prime is 513213949. The next prime is 513213977. The reversal of 513213971 is 179312315.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 513213971 - 2⁶ = 513213907 is a prime.

It is not a weakly prime, because it can be changed into another prime (513213977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256606985 + 256606986.

It is an arithmetic number, because the mean of its divisors is an integer number (256606986).

Almost surely, 2^513213971 is an apocalyptic number.

513213971 is a deficient number, since it is larger than the sum of its proper divisors (1).

513213971 is an equidigital number, since it uses as much as digits as its factorization.

513213971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5670, while the sum is 32.

The square root of 513213971 is about 22654.2263385886. The cubic root of 513213971 is about 800.6317775026.

The spelling of 513213971 in words is "five hundred thirteen million, two hundred thirteen thousand, nine hundred seventy-one".