1221285654 has 32 divisors (see below), whose sum is σ = 2715408480. Its totient is φ = 406879200.

The previous prime is 1221285649. The next prime is 1221285673. The reversal of 1221285654 is 4565821221.

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, 121584 + ... + 131244.

It is an arithmetic number, because the mean of its divisors is an integer number (84856515).

Almost surely, 2^1221285654 is an apocalyptic number.

1221285654 is an abundant number, since it is smaller than the sum of its proper divisors (1494122826).

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

1221285654 is a wasteful number, since it uses less digits than its factorization.

1221285654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12013 (or 12007 counting only the distinct ones).

The product of its digits is 38400, while the sum is 36.

The square root of 1221285654 is about 34946.8976305480. The cubic root of 1221285654 is about 1068.9049425099.

The spelling of 1221285654 in words is "one billion, two hundred twenty-one million, two hundred eighty-five thousand, six hundred fifty-four".