612221505 has 32 divisors (see below), whose sum is σ = 1121311488. Its totient is φ = 279417600.

The previous prime is 612221503. The next prime is 612221509. The reversal of 612221505 is 505122216.

It is a happy number.

It is not a de Polignac number, because 612221505 - 2¹ = 612221503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (612221501) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 64995 + ... + 73815.

It is an arithmetic number, because the mean of its divisors is an integer number (35040984).

Almost surely, 2^612221505 is an apocalyptic number.

It is an amenable number.

612221505 is a deficient number, since it is larger than the sum of its proper divisors (509089983).

612221505 is a wasteful number, since it uses less digits than its factorization.

612221505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9497.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 612221505 is about 24743.1102531594. The cubic root of 612221505 is about 849.1208927169.

The spelling of 612221505 in words is "six hundred twelve million, two hundred twenty-one thousand, five hundred five".