1221500993 has 4 divisors (see below), whose sum is σ = 1221620400. Its totient is φ = 1221381588.

The previous prime is 1221500947. The next prime is 1221501007. The reversal of 1221500993 is 3990051221.

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 1221500993 - 2⁸ = 1221500737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221500933) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 42755 + ... + 65352.

It is an arithmetic number, because the mean of its divisors is an integer number (305405100).

Almost surely, 2^1221500993 is an apocalyptic number.

It is an amenable number.

1221500993 is a deficient number, since it is larger than the sum of its proper divisors (119407).

1221500993 is a wasteful number, since it uses less digits than its factorization.

1221500993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119406.

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 1221500993 is about 34949.9784406228. The cubic root of 1221500993 is about 1068.9677624826.

The spelling of 1221500993 in words is "one billion, two hundred twenty-one million, five hundred thousand, nine hundred ninety-three".