1213022564 has 24 divisors (see below), whose sum is σ = 2315026560. Its totient is φ = 552767904.

The previous prime is 1213022557. The next prime is 1213022581. The reversal of 1213022564 is 4652203121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143534 + ... + 151749.

It is an arithmetic number, because the mean of its divisors is an integer number (96459440).

Almost surely, 2^1213022564 is an apocalyptic number.

It is an amenable number.

1213022564 is a deficient number, since it is larger than the sum of its proper divisors (1102003996).

1213022564 is a wasteful number, since it uses less digits than its factorization.

1213022564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295379 (or 295377 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 1213022564 is about 34828.4734664039. The cubic root of 1213022564 is about 1066.4887857456.

Adding to 1213022564 its reverse (4652203121), we get a palindrome (5865225685).

The spelling of 1213022564 in words is "one billion, two hundred thirteen million, twenty-two thousand, five hundred sixty-four".