511220393 has 2 divisors, whose sum is σ = 511220394. Its totient is φ = 511220392.

The previous prime is 511220383. The next prime is 511220419. The reversal of 511220393 is 393022115.

It is an a-pointer prime, because the next prime (511220419) can be obtained adding 511220393 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 510624409 + 595984 = 22597^2 + 772^2 .

It is a cyclic number.

It is not a de Polignac number, because 511220393 - 2¹⁴ = 511204009 is a prime.

It is a super-2 number, since 2×511220393² = 522692580438148898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (511220383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255610196 + 255610197.

It is an arithmetic number, because the mean of its divisors is an integer number (255610197).

Almost surely, 2^511220393 is an apocalyptic number.

It is an amenable number.

511220393 is a deficient number, since it is larger than the sum of its proper divisors (1).

511220393 is an equidigital number, since it uses as much as digits as its factorization.

511220393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 511220393 is about 22610.1833915605. The cubic root of 511220393 is about 799.5937484220.

The spelling of 511220393 in words is "five hundred eleven million, two hundred twenty thousand, three hundred ninety-three".