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1831240849 = 427932

1831240849 has 3 divisors (see below), whose sum is σ = 1831283643. Its totient is φ = 1831198056.

The previous prime is 1831240847. The next prime is 1831240909. The reversal of 1831240849 is 9480421381.

The square root of 1831240849 is 42793.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 956974225 + 874266624 = 30935^2 + 29568^2 .

It is not a de Polignac number, because 1831240849 - 21 = 1831240847 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1831240847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 21397 + ... + 64189.

It is an arithmetic number, because the mean of its divisors is an integer number (610427881).

Almost surely, 21831240849 is an apocalyptic number.

1831240849 is the 42793-rd square number.

1831240849 is the 21397-th centered octagonal number.

It is an amenable number.

1831240849 is a deficient number, since it is larger than the sum of its proper divisors (42794).

1831240849 is an frugal number, since it uses more digits than its factorization.

1831240849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85586 (or 42793 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The cubic root of 1831240849 is about 1223.4375969478.

The spelling of 1831240849 in words is "one billion, eight hundred thirty-one million, two hundred forty thousand, eight hundred forty-nine".

Divisors: 1 42793 1831240849