509026381 has 2 divisors, whose sum is σ = 509026382. Its totient is φ = 509026380.

The previous prime is 509026319. The next prime is 509026411. The reversal of 509026381 is 183620905.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 372837481 + 136188900 = 19309^2 + 11670^2 .

It is a cyclic number.

It is not a de Polignac number, because 509026381 - 2⁷ = 509026253 is a prime.

It is a super-2 number, since 2×509026381² = 518215713107914322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (509026081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254513190 + 254513191.

It is an arithmetic number, because the mean of its divisors is an integer number (254513191).

Almost surely, 2^509026381 is an apocalyptic number.

It is an amenable number.

509026381 is a deficient number, since it is larger than the sum of its proper divisors (1).

509026381 is an equidigital number, since it uses as much as digits as its factorization.

509026381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 509026381 is about 22561.6129964150. The cubic root of 509026381 is about 798.4482320707.

The spelling of 509026381 in words is "five hundred nine million, twenty-six thousand, three hundred eighty-one".