1831221045 has 72 divisors (see below), whose sum is σ = 3549755040. Its totient is φ = 870704640.

The previous prime is 1831221043. The next prime is 1831221047. The reversal of 1831221045 is 5401221381.

It is an interprime number because it is at equal distance from previous prime (1831221043) and next prime (1831221047).

It is not a de Polignac number, because 1831221045 - 2¹ = 1831221043 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1831221043) 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 71 ways as a sum of consecutive naturals, for example, 243390 + ... + 250800.

Almost surely, 2^1831221045 is an apocalyptic number.

1831221045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1831221045 is a deficient number, since it is larger than the sum of its proper divisors (1718533995).

1831221045 is a wasteful number, since it uses less digits than its factorization.

1831221045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7475 (or 7455 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 1831221045 is about 42792.7686063896. The cubic root of 1831221045 is about 1223.4331866331.

The spelling of 1831221045 in words is "one billion, eight hundred thirty-one million, two hundred twenty-one thousand, forty-five".