511261 has 2 divisors, whose sum is σ = 511262. Its totient is φ = 511260.

The previous prime is 511243. The next prime is 511279. The reversal of 511261 is 162115.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (511243) and next prime (511279).

It can be written as a sum of positive squares in only one way, i.e., 511225 + 36 = 715^2 + 6^2 .

It is a cyclic number.

It is not a de Polignac number, because 511261 - 2¹⁵ = 478493 is a prime.

It is a super-2 number, since 2×511261² = 522775620242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (511201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255630 + 255631.

It is an arithmetic number, because the mean of its divisors is an integer number (255631).

2⁵¹¹²⁶¹ is an apocalyptic number.

It is an amenable number.

511261 is a deficient number, since it is larger than the sum of its proper divisors (1).

511261 is an equidigital number, since it uses as much as digits as its factorization.

511261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60, while the sum is 16.

The square root of 511261 is about 715.0251743820. The cubic root of 511261 is about 79.9614918837.

Adding to 511261 its reverse (162115), we get a palindrome (673376).

The spelling of 511261 in words is "five hundred eleven thousand, two hundred sixty-one".