1222528681 has 4 divisors (see below), whose sum is σ = 1333667664. Its totient is φ = 1111389700.

The previous prime is 1222528649. The next prime is 1222528717. The reversal of 1222528681 is 1868252221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1222528681 - 2⁵ = 1222528649 is a prime.

It is a super-2 number, since 2×1222528681² = 2989152751735199522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1222528681.

It is not an unprimeable number, because it can be changed into a prime (1222528621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55569475 + ... + 55569496.

It is an arithmetic number, because the mean of its divisors is an integer number (333416916).

Almost surely, 2^1222528681 is an apocalyptic number.

1222528681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1222528681 is a deficient number, since it is larger than the sum of its proper divisors (111138983).

1222528681 is a wasteful number, since it uses less digits than its factorization.

1222528681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111138982.

The product of its digits is 30720, while the sum is 37.

The square root of 1222528681 is about 34964.6776189914. The cubic root of 1222528681 is about 1069.2674640809.

The spelling of 1222528681 in words is "one billion, two hundred twenty-two million, five hundred twenty-eight thousand, six hundred eighty-one".