1056218781 has 8 divisors (see below), whose sum is σ = 1408777920. Its totient is φ = 703902752.

The previous prime is 1056218777. The next prime is 1056218851. The reversal of 1056218781 is 1878126501.

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 1056218781 - 2² = 1056218777 is a prime.

It is a super-2 number, since 2×1056218781² = 2231196226674251922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1056218771) 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, 50385 + ... + 68198.

It is an arithmetic number, because the mean of its divisors is an integer number (176097240).

Almost surely, 2^1056218781 is an apocalyptic number.

It is an amenable number.

1056218781 is a deficient number, since it is larger than the sum of its proper divisors (352559139).

1056218781 is a wasteful number, since it uses less digits than its factorization.

1056218781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121555.

The product of its (nonzero) digits is 26880, while the sum is 39.

The square root of 1056218781 is about 32499.5197041433. The cubic root of 1056218781 is about 1018.3989945069.

The spelling of 1056218781 in words is "one billion, fifty-six million, two hundred eighteen thousand, seven hundred eighty-one".