612221913 has 6 divisors (see below), whose sum is σ = 884320554. Its totient is φ = 408147936.

The previous prime is 612221899. The next prime is 612221927. The reversal of 612221913 is 319122216.

612221913 is a `hidden beast` number, since 612 + 22 + 19 + 13 = 666.

It is an interprime number because it is at equal distance from previous prime (612221899) and next prime (612221927).

It can be written as a sum of positive squares in only one way, i.e., 372219849 + 240002064 = 19293^2 + 15492^2 .

It is not a de Polignac number, because 612221913 - 2¹⁷ = 612090841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (612221993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34012320 + ... + 34012337.

It is an arithmetic number, because the mean of its divisors is an integer number (147386759).

Almost surely, 2^612221913 is an apocalyptic number.

It is an amenable number.

612221913 is a deficient number, since it is larger than the sum of its proper divisors (272098641).

612221913 is a wasteful number, since it uses less digits than its factorization.

612221913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68024663 (or 68024660 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 612221913 is about 24743.1184978773. The cubic root of 612221913 is about 849.1210813421.

The spelling of 612221913 in words is "six hundred twelve million, two hundred twenty-one thousand, nine hundred thirteen".