1820134471 has 4 divisors (see below), whose sum is σ = 1830303000. Its totient is φ = 1809965944.

The previous prime is 1820134411. The next prime is 1820134489. The reversal of 1820134471 is 1744310281.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1820134471 - 2⁷ = 1820134343 is a prime.

It is a super-3 number, since 3×1820134471³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820134411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5083996 + ... + 5084353.

It is an arithmetic number, because the mean of its divisors is an integer number (457575750).

Almost surely, 2^1820134471 is an apocalyptic number.

1820134471 is a deficient number, since it is larger than the sum of its proper divisors (10168529).

1820134471 is a wasteful number, since it uses less digits than its factorization.

1820134471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10168528.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 1820134471 is about 42663.0340107217. The cubic root of 1820134471 is about 1220.9592185234.

The spelling of 1820134471 in words is "one billion, eight hundred twenty million, one hundred thirty-four thousand, four hundred seventy-one".