511221023 has 8 divisors (see below), whose sum is σ = 545854848. Its totient is φ = 477621144.

The previous prime is 511221013. The next prime is 511221041. The reversal of 511221023 is 320122115.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 511221023 - 2²⁶ = 444112159 is a prime.

It is a super-2 number, since 2×511221023² = 522693868714333058, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 511220992 and 511221010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (511221013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 257465 + ... + 259442.

It is an arithmetic number, because the mean of its divisors is an integer number (68231856).

Almost surely, 2^511221023 is an apocalyptic number.

511221023 is a deficient number, since it is larger than the sum of its proper divisors (34633825).

511221023 is a wasteful number, since it uses less digits than its factorization.

511221023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516973.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 511221023 is about 22610.1973233318. The cubic root of 511221023 is about 799.5940768804.

Adding to 511221023 its reverse (320122115), we get a palindrome (831343138).

The spelling of 511221023 in words is "five hundred eleven million, two hundred twenty-one thousand, twenty-three".