1831305945 has 16 divisors (see below), whose sum is σ = 3348673920. Its totient is φ = 837168384.

The previous prime is 1831305923. The next prime is 1831305961. The reversal of 1831305945 is 5495031381.

It is not a de Polignac number, because 1831305945 - 2⁵ = 1831305913 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8720400 + ... + 8720609.

It is an arithmetic number, because the mean of its divisors is an integer number (209292120).

Almost surely, 2^1831305945 is an apocalyptic number.

1831305945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1831305945 is a deficient number, since it is larger than the sum of its proper divisors (1517367975).

1831305945 is a wasteful number, since it uses less digits than its factorization.

1831305945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17441024.

The product of its (nonzero) digits is 64800, while the sum is 39.

The square root of 1831305945 is about 42793.7605849264. The cubic root of 1831305945 is about 1223.4520934844.

The spelling of 1831305945 in words is "one billion, eight hundred thirty-one million, three hundred five thousand, nine hundred forty-five".