1225021646 has 16 divisors (see below), whose sum is σ = 1864954368. Its totient is φ = 603384600.

The previous prime is 1225021643. The next prime is 1225021663. The reversal of 1225021646 is 6461205221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225021643) 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, 216311 + ... + 221901.

It is an arithmetic number, because the mean of its divisors is an integer number (116559648).

Almost surely, 2^1225021646 is an apocalyptic number.

1225021646 is a deficient number, since it is larger than the sum of its proper divisors (639932722).

1225021646 is a wasteful number, since it uses less digits than its factorization.

1225021646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7207.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 1225021646 is about 35000.3092272054. The cubic root of 1225021646 is about 1069.9937828270.

Adding to 1225021646 its reverse (6461205221), we get a palindrome (7686226867).

The spelling of 1225021646 in words is "one billion, two hundred twenty-five million, twenty-one thousand, six hundred forty-six".