1221612575 has 6 divisors (see below), whose sum is σ = 1514799624. Its totient is φ = 977290040.

The previous prime is 1221612551. The next prime is 1221612599. The reversal of 1221612575 is 5752161221.

It is an interprime number because it is at equal distance from previous prime (1221612551) and next prime (1221612599).

It is not a de Polignac number, because 1221612575 - 2²² = 1217418271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24432227 + ... + 24432276.

It is an arithmetic number, because the mean of its divisors is an integer number (252466604).

Almost surely, 2^1221612575 is an apocalyptic number.

1221612575 is a deficient number, since it is larger than the sum of its proper divisors (293187049).

1221612575 is an equidigital number, since it uses as much as digits as its factorization.

1221612575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48864513 (or 48864508 counting only the distinct ones).

The product of its digits is 8400, while the sum is 32.

The square root of 1221612575 is about 34951.5747141670. The cubic root of 1221612575 is about 1069.0003109427. Note that the first 3 decimals are identical.

Adding to 1221612575 its reverse (5752161221), we get a palindrome (6973773796).

The spelling of 1221612575 in words is "one billion, two hundred twenty-one million, six hundred twelve thousand, five hundred seventy-five".