1745135821 has 32 divisors (see below), whose sum is σ = 2116372608. Its totient is φ = 1417616640.

The previous prime is 1745135797. The next prime is 1745135831. The reversal of 1745135821 is 1285315471.

It is the 17055-th star number.

It is not a de Polignac number, because 1745135821 - 2⁵ = 1745135789 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1745135831) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1200331 + ... + 1201783.

It is an arithmetic number, because the mean of its divisors is an integer number (66136644).

Almost surely, 2^1745135821 is an apocalyptic number.

1745135821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1745135821 is a deficient number, since it is larger than the sum of its proper divisors (371236787).

1745135821 is a wasteful number, since it uses less digits than its factorization.

1745135821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1741.

The product of its digits is 33600, while the sum is 37.

The square root of 1745135821 is about 41774.8228123112. The cubic root of 1745135821 is about 1203.9535852296.

The spelling of 1745135821 in words is "one billion, seven hundred forty-five million, one hundred thirty-five thousand, eight hundred twenty-one".