1681199145 has 48 divisors (see below), whose sum is σ = 3153451392. Its totient is φ = 857640960.

The previous prime is 1681199123. The next prime is 1681199183. The reversal of 1681199145 is 5419911861.

It is not a de Polignac number, because 1681199145 - 2⁹ = 1681198633 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1681199145.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2136 + ... + 58025.

It is an arithmetic number, because the mean of its divisors is an integer number (65696904).

Almost surely, 2^1681199145 is an apocalyptic number.

1681199145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1681199145 is a deficient number, since it is larger than the sum of its proper divisors (1472252247).

1681199145 is an equidigital number, since it uses as much as digits as its factorization.

1681199145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60204 (or 60192 counting only the distinct ones).

The product of its digits is 77760, while the sum is 45.

The square root of 1681199145 is about 41002.4285256374. The cubic root of 1681199145 is about 1189.0671655176.

The spelling of 1681199145 in words is "one billion, six hundred eighty-one million, one hundred ninety-nine thousand, one hundred forty-five".