612228381 has 16 divisors (see below), whose sum is σ = 839791488. Its totient is φ = 396446400.

The previous prime is 612228377. The next prime is 612228403. The reversal of 612228381 is 183822216.

It is not a de Polignac number, because 612228381 - 2² = 612228377 is a prime.

It is a super-2 number, since 2×612228381² = 749647181003762322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (612228301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65671 + ... + 74411.

It is an arithmetic number, because the mean of its divisors is an integer number (52486968).

Almost surely, 2^612228381 is an apocalyptic number.

It is an amenable number.

612228381 is a deficient number, since it is larger than the sum of its proper divisors (227563107).

612228381 is a wasteful number, since it uses less digits than its factorization.

612228381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9412.

The product of its digits is 9216, while the sum is 33.

The square root of 612228381 is about 24743.2492005395. The cubic root of 612228381 is about 849.1240715954.

The spelling of 612228381 in words is "six hundred twelve million, two hundred twenty-eight thousand, three hundred eighty-one".