511221240 has 64 divisors (see below), whose sum is σ = 1704074400. Its totient is φ = 136325376.

The previous prime is 511221233. The next prime is 511221259. The reversal of 511221240 is 42122115.

It is a super-2 number, since 2×511221240² = 522694312454275200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 235597 + ... + 237756.

Almost surely, 2^511221240 is an apocalyptic number.

It is an amenable number.

511221240 is an abundant number, since it is smaller than the sum of its proper divisors (1192853160).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

511221240 is a wasteful number, since it uses less digits than its factorization.

511221240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473373 (or 473363 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 511221240 is about 22610.2021220510. The cubic root of 511221240 is about 799.5941900160.

Adding to 511221240 its reverse (42122115), we get a palindrome (553343355).

The spelling of 511221240 in words is "five hundred eleven million, two hundred twenty-one thousand, two hundred forty".